This book explores the thought of Jacques Derrida as it relates to the tradition of apophatic thought--negative theology and philosophy--in both Western and Eastern traditions. Following the Introduction by Toby Foshay, two of Derrida's essays on negative theology, Of an Apocalyptic Tone Newly Adopted in Philosophy and How to Avoid Speaking: Denials, are reprinted here. These are followed by essays from a Western perspective by Mark C. Taylor and Michel Despland, and essays from an Eastern perspective by David Loy, (...) a Buddhist, and Harold Coward, a Hindu. In the Conclusion, Jacques Derrida responds to these discussions. (shrink)

The variety DMM of De Morgan monoids has just four minimal subvarieties. The join-irreducible covers of these atoms in the subvariety lattice of DMM are investigated. One of the two atoms consisting of idempotent algebras has no such cover; the other has just one. The remaining two atoms lack nontrivial idempotent members. They are generated, respectively, by 4-element De Morgan monoids C4 and D4, where C4 is the only nontrivial 0-generated algebra onto which finitely subdirectly irreducible De Morgan monoids may (...) be mapped by noninjective homomorphisms. The homomorphic preimages of C4 within DMM constitute a proper quasivariety, which is shown to have a largest subvariety U. The covers of the variety within U are revealed here. There are just ten of them. In exactly six of these ten varieties, all nontrivial members have C4 as a retract. In the varietal join of those six classes, every subquasivariety is a variety—in fact, every finite subdirectly irreducible algebra is projective. Beyond U, all covers of [or of ] within DMM are discriminator varieties. Of these, we identify infinitely many that are finitely generated, and some that are not. We also prove that there are just 68 minimal quasivarieties of De Morgan monoids. (shrink)

This careful and engaging introduction to Aristotle equips readers of ancient philosophy and classics with an intellectual map that will guide their further exploration within the terrains of Aristotelian philosophy and logic. The book does not seek to provide a verdict or to persuade the reader of the usefulness of Aristotle's ideas. Instead it offers a comprehensive introduction to key philosophical areas while situating the reader within the ongoing intellectual debates on Aristotle's significance and relevance. Crowley's book allows an overview (...) of Aristotle's contributions and includes discussions on the Organon, the epitome of his logical treatises, his works on biology, nature and causation, metaphysics, citizenship, ethics and eudaimonia. The book is a valuable tool for readers interested in becoming acquainted with the work of Aristotle but most importantly for those who are keen to understand his many interpretations. (shrink)

According to much modern social psychology, behavioural economics and common sense, people's actions and beliefs are frequently the result of rapid intuitive thought rather than careful deliberation. Richard Thaler and Cass Sunstein, in their influential book, Nudge, synthesised the literature and used it as the basis for numerous policy ideas.1 Not least, they gave the word ‘nudge’ as a handy term to apply to all sorts of ways of taking advantage of people's psychological quirks without coercing or bribing them. But (...) while Nudge was long on ideas and enthusiasm, it was short on conceptual clarity. The idea of a nudge was inconsistent with some of the policies Thaler and Sunstein endorsed and their account of nudging's relation to freedom and paternalism was flawed.In Salvaging the concept of nudge, Yashar Saghai acts as a friendly critic who thinks nudging has plenty to offer the policy world but sees that it needs both conceptual clarity and ethical defence.2 He wants to show how some of ways of taking advantage of people's psychology could leave them as free as before and he is especially concerned with what I would describe as a question of manipulation: …. (shrink)

[T. M. Scanlon] It is clearly impermissible to kill one person because his organs can be used to save five others who are in need of transplants. It has seemed to many that the explanation for this lies in the fact that in such cases we would be intending the death of the person whom we killed, or failed to save. What makes these actions impermissible, however, is not the agent's intention but rather the fact that the benefit envisaged does (...) not justify an exception to the prohibition against killing or the requirement to give aid. The difference between this explanation and one appealing to intention is easily overlooked if one fails to distinguish between the prospective use of a moral principle to guide action and its retrospective use to appraise the way an agent governed him or herself. Even if this explanation is accepted, however, it remains an open question whether and how an agent's intention may be relevant to the permissibility of actions in other cases. \\\ [Jonathan Dancy] My first four sections concentrate on the second section of Professor Scanlon's contribution, where he lays out his conception of moral principles and of the role they play in theory and practice. I will raise questions on the following issues: 1. Scanlon's initial introduction of the notion of a principle. 2. His rejection of the standard view that principles are concerned with the forbidding, permitting and requiring of actions. 3. His rejection of pro tanto conceptions of principles in favour of a conception of them as conclusive. 4. The resulting account of what it is for a principle to face and survive exceptions. Scanlon's discussion of these matters here both appeals to and is in some respects more detailed than the relevant section of his recent What We Owe to Each Other. The topic is interesting both for the role played by principles in Scanlon's present discussion of intention and permissibility, and more generally because of his account of wrongness: an act is wrong iff it is ruled out by principles that nobody could reasonably reject. The remainder of my contribution is concerned with the ostensible focus of IP, namely the relevance of agent-intentions to the permissibility of what is done. (shrink)

Superstring theory is an extension of conventional quantum field theory that allows for stringlike and branelike material objects besides pointlike particles. The basic foundations on which the theory is built are amazingly shaky, and, equally amazingly, it seems to be this lack of solid foundations to which the theory owes its strength. We emphasize that such a situation is legitimate only in the development phases of a new doctrine. Eventually, a more solidly founded structure must be sought.Although it is advertised (...) as a “candidate theory of quantum gravity”, we claim that string theory may not be exactly that. Rather, just like quantum field theory itself, it is a general mathematical framework for a class of theories. Its major flaw could be that it still embraces a Copenhagen view on the relation between quantum mechanics and reality, while any “theory of everything”, that is, a theory for the entire cosmos, should do better than that. (shrink)

In social cognition, knowledge-based validation of information is usually regarded as relying on strategic and resource-demanding processes. Research on language comprehension, in contrast, suggests that validation processes are involved in the construction of a referential representation of the communicated information. This view implies that individuals can use their knowledge to validate incoming information in a routine and efficient manner. Consistent with this idea, Experiments 1 and 2 demonstrated that individuals are able to reject false assertions efficiently when they have validity-relevant (...) beliefs. Validation processes were carried out routinely even when individuals were put under additional cognitive load during comprehension. Experiment 3 demonstrated that the rejection of false information occurs automatically and interferes with affirmative responses in a nonsemantic task. Experiment 4 also revealed complementary interference effects of true information with negative responses in a nonsemantic task. These results suggest the existence of fast and efficient validation processes that protect mental representations from being contaminated by false and inaccurate information. (shrink)

This chapter examines the philosophy of T. H. Green, the initial leading figure among the absolute idealists who dominated British philosophy in the late 19th century. Green sought to establish that the existence and nature of human beings, especially of the human mind, was not susceptible of a purely empirical or scientific explanation. He claimed that the only possible explanation involved reference to the existence of an Eternal Consciousness, which was gradually realizing itself in the temporal world, more especially in (...) the life of human beings. Further issues in his philosophy are examined, such as that things count as real only if they are in unchanging relations to each other, the difference between negative and positive freedom, the nature of moral choice, the superiority of a virtue ethic to a utilitarian one. (shrink)

Philosophers and psychologists generally hold that, in light of the empirical data, a subject lacks infallible access to her own mental states. However, while subjects certainly are fallible in some ways, I show that the data fails to discredit that a subject has infallible access to her own occurrent thoughts and judgments. This is argued, first, by revisiting the empirical studies, and carefully scrutinizing what is shown exactly. Second, I argue that if the data were interpreted to rule out all (...) such infallibility, the relevant psychological studies would be self-effacing. For they adopt a methodology where a subject is simply presumed to know her own second-order thoughts and judgments--as if she were infallible about them. After all, what she expresses as her second-order judgment is trusted as accurate without independent evidence — even though such judgments often misrepresent the subject’s first-order states. The upshot is that such studies do not discredit all infallibility hypotheses regarding self-attributions of occurrent states. (shrink)

In this paper I propose a solution to the qualitative version of David Miller's verisimilitude reversal argument. Miller (1974) shows that verisimilitude rankings are relative to language choice and hence, are not objective. My solution stems from a reply to an earlier solution proposed by Eric Barnes (1991). Barnes argues that the verisimilitude reversal problem can be solved by revealing an epistemic dimension. I show that Miller's problem cannot be solved by side-stepping foundational metaphysical claims as his epistemic solution suggests. (...) Rather, a substantive metaphysical basis grounds identity relations among properties. The problem of verisimilitude cannot be solved without embracing the fundamental metaphysical distinctions between basic and composite properties that ground the relationship of partial identity among properties. (shrink)

I argue that Open Theism leads to a retreat from ascribing to God ‘complete omniscience’. Having surrendered this ground, the Open Theist cannot but retreat from ascribing to God complete omnipotence; the Open Theist must admit that God might perform actions which He reasonably expected would meet certain descriptions but which nevertheless do not do so. This then makes whatever goodness (in the sense of beneficence, not just benevolence) God has a matter of luck. Open Theism is committed to a (...) partially ignorant God, one who is subject to the vagaries of luck for the efficacy of at least some of His actions and for His goodness. (shrink)

Some philosophers have thought that life could only be meaningful if there is no God. For Sartre and Nagel, for example, a God of the traditional classical theistic sort would constrain our powers of self-creative autonomy in ways that would severely detract from the meaning of our lives, possibly even evacuate our lives of all meaning. Some philosophers, by contrast, have thought that life could only be meaningful if there is a God. God and the Meanings of Life is interested (...) in exploring the truth in both these schools of thought, seeking to discover what God could and couldn't do to make life meaningful (as well as what he would and wouldn't do). Mawson espouses a version of the 'amalgam' or 'pluralism' thesis about the issue of life's meaning – in essence, that there are a number of different legitimate meanings of 'meaning' (and indeed 'life') in the question of life's meaning. According to Mawson, God, were he to exist, would help make life meaningful in some of these senses and hinder in some others. He argues that whilst there could be meaning in a Godless universe, there could be other sorts of meaning in a Godly one and that these would be deeper. (shrink)

My purpose in what follows is not so much to defend the basic principle of utilitarianism as to indicate the form of it which seems most promising as a basic moral and political position. I shall take the principle of utility as offering a criterion for two different sorts of evaluation: first, the merits of acts of government, social policies, and social institutions, and secondly, the ultimate moral evaluation of the actions of individuals. I do not take it as implying (...) that the individual should live his life on the basis of constant evaluations of this sort. For there are different levels of decision making each with its appropriate criteria. For example, we each inevitably make many of our decisions from the point of view of our own personal self-fulfilment and this cannot regularly take a directly utilitarian form, nor should the utilitarian want it to do so. His claim is at most that we should sometimes review our life from the point of view of a kind of impersonal moral truth of a universalistic utilitarian character. (shrink)

Governments can try to counter obesity through preventive regulations such as sugar taxes, which appear to raise costs or reduce options for consumers. Would the regulations improve the welfare of adult consumers? The regulations might improve choice sets through a mechanism such as reformulation, but the scope for such improvement is limited. Otherwise, a paternalistic argument must be made that preventive regulations would improve welfare despite reducing choice. This paper connects arguments about obesity, health, and choice to a philosophically plausible (...) view of welfare. On the negative side, two errors to avoid are failing to see the limited value of health and thinking that findings of irrationality would alone settle arguments about welfare. On the positive side, preventive regulations could make people better-off if welfare is the satisfaction of preferences and if preventive regulations could better satisfy preferences by overcoming certain forms of irrationality. The leading evidence is from widespread attempts to lose weight. However, at least for the United States, most adults are not trying to lose weight, and that casts doubt on whether they would benefit from preventive regulations. If they would not, that seems a strong albeit not decisive reason against these regulations. (shrink)

This paper argues that the Food and Drug Administration’s (FDA) policy for health and wellness apps is ethically problematic. Currently, the FDA does not regulate health and wellness apps that are not intended for medical use. As a result of this hands‐off policy, preventing harm to consumers is left primarily to developers and app marketplaces. We argue that the FDA’s duties to prevent harm and maintain accountability to the American public require that they play a much stronger role. We also (...) discuss concerns about efficiency and fostering innovation, and argue that while they should help shape FDA regulation of health and wellness apps, they do not justify complete absence of FDA involvement. -/- . (shrink)

This paper aims to show that many criticisms of McDowell’s naturalism of second nature are based on what I call ‘the orthodox interpretation’ of McDowell’s naturalism. The orthodox interpretation is, however, a misinterpretation, which results from the fact that the phrase ‘the space of reasons’ is used equivocally by McDowell in Mind and World. Failing to distinguish two senses of ‘the space of reasons’, I argue that the orthodox interpretation renders McDowell’s naturalism inconsistent with McDowell’s Hegelian thesis that the conceptual (...) is unbounded. My interpretation saves McDowell from being inconsistent. However, the upshot of my interpretation is that what is really at work in McDowell’s diagnosis of the dualism between nature and reason is the Hegelian thesis, not the naturalism of second nature. (shrink)

The world appears to conscious creatures in terms of experienced sensory qualities, but science doesn't find sensory experience in that world, only physical objects and properties. I argue that the failure to locate consciousness in the world is a function of our necessarily representational relation to reality as knowers: we won't discover the terms in which reality is represented by us in the world as it appears in those terms. Qualia -- arguably a type of representational content -- will therefore (...) not be found in the physical world as characterized in experience or science. Instead, consciousness constitutes a subjective, representational reality for cognitive systems such as ourselves, and the physical world is a represented objective reality. I suggest that naturalistic approaches to explaining consciousness should acknowledge the non-objectivity of experience, and be constrained by evidence that consciousness accompanies certain sorts of behaviour-controlling representational functions carried out by complex, physically instantiated mind-systems. I evaluate a variety of current hypotheses about consciousness, and suggest that a mature science of representation may help explain why, perhaps as matter of representational necessity, experience arises as a natural but not objectively discoverable phenomenon. (shrink)

Current debates surrounding Aristotle's Politics involve attempts to explain the role of political participation in the pursuit of Aristotle's human telos, eudaimonia. Many argue that political participation is crucial to eudaimonia, equating the good man with the good citizen. Often this argument is based on Aristotle's labelling of humans as zoon politikon, or ‘political animal’, and the misleading translation of eudaimonia as ‘happiness’. We provide supported explanations of eudaimonia and zoon politikon which do not force us to equate the good (...) man and the good citizen. We illustrate Aristotle's analogy between the eudaimon man and the eudaimon polis and emphasize the role political participation sometimes plays in the pursuit of eudaimonia. On the basis of this evidence, we argue that Aristotle did not equate the good man with the good citizen necessarily, nor did he find political participation essential to eudaimonia. We then demonstrate that even without political participation, the polis plays a unique role in the pursuit of eudaimonia. (shrink)

Green agrees with Kant on the abstract character of moral law as categorical imperatives and that intentional dispositions are central to a moral justification of punishment. The central problem with Kant's account is that we are unable to know these dispositions beyond a reasonable estimate. Green offers a practical alternative, positing moral law as an ideal to be achieved, but not immediately enforceable through positive law. Moral and positive law are bridged by Green's theory of the common good through the (...) dialectic of morality. Thus, Green appears to offer an alternative that remains committed to Kantian morality whilst taking proper stock of our cognitive limitations. Unfortunately, Green fails to unravel fully Kant's dichotomy of moral and positive law that mirrors Green's solution, although Green offers a number of improvements, such as the importance of the community in establishing rights and linking the severity of punishment to the extent that a criminal act threatens the continued maintenance of a system of rights. (shrink)

In recent ”secular’ Epistemology, much attention has been paid to formulating an ”anti-luck’ or ”safety’ condition; it is now widely held that such a condition is an essential part of any satisfactory post-Gettier reflection on the nature of knowledge. In this paper, I explain the safety condition as it has emerged and then explore some implications of and for it arising from considering the God issue. It looks at the outset as if safety might be ”good news’ for a view (...) characteristic of Reformed Epistemology, viz. the view that if Theism is true, many philosophically unsophisticated believers probably know that it’s true. A sub-conclusion of my paper though suggests that as safety does not by itself turn true belief into knowledge, the recent focus on it is not quite such good news for Reformed Epistemologists as they may have hoped: it’s not that safety provides a new route by which they can reach this sort of conclusion. But safety is still good news for their view at least in the sense that there is no reason arising from considering it to count these philosophically unsophisticated believers as not knowing that there’s a God. I conclude by reflecting that good news for Reformed Epistemology is perhaps bad news for the discipline of Philosophy of Religion more generally, as there’s a possible ”reflection destroys knowledge’-implication to be drawn. Those who have been led to their religious beliefs in at least some philosophically unsophisticated ways seem to enjoy much safer religious beliefs than those who have been led to their religious beliefs by philosophical reflection, so the discipline as a whole will be adversely affected if safety is eventually accorded the role of a necessary condition for knowledge. (shrink)

Open peer commentary on the article “Interactivity and Enaction in Human Cognition” by Matthew Isaac Harvey, Rasmus Gahrn-Andersen & Sune Vork Steffensen. Upshot: Enaction is a diverse research program and some of its texts can be interpreted in terms of a critical contrast to interactivity. Yet much of the former has already started to move in a direction favored by the latter: toward systematic studies of how human activity is shaped by social, cultural, and technological influences. Interactivity could therefore help (...) enaction to provide a better account of such highly mediated and augmented forms of sense-making. (shrink)

This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be (...) preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant. (shrink)

The pages of the history of science record thousands of instances of similar discoveries having been made by scientists working independently of one another. Sometimes the discoveries are simultaneous or almost so; sometimes a scientist will make anew a discovery which, unknown to him, somebody else had made years before.

We identify the \-ideals of a distributive demi-pseudocomplemented algebra L as the kernels of the boolean congruences on L, and show that they form a complete Heyting algebra which is isomorphic to the interval \ of the congruence lattice of L where G is the Glivenko congruence. We also show that the notions of maximal \-ideal, prime \-ideal, and falsity ideal coincide.

The primary goal of this essay is to demonstrate that Leibniz’s objections to theological voluntarism are tightly connected to his overarching metaphysical system; a secondary goal is to show that his objections are not without some merit. Leibniz, it is argued, holds to strong versions of the imago dei doctrine, i.e., creatures are made in the image of God, and imitatio dei doctrine, i.e., creatures ought to imitate God. Consequently, God and creatures must possess similar structures of moral psychology, and (...) must be motivated in similar ways. Yet, Leibniz argues, a thoroughgoing voluntarism would obstruct both doctrines in philosophically unsettling ways, impeding the possibility for creatures to genuinely imitate God. (shrink)

As is well known, many editors, following Valckenaer, reject the bracketed line altogether; but the omission leaves the opening clause with a very unsatisfactory ending. μπρέποντας αίθέρι, heavily stressed by its position, seems to form little less than an anticlimax, unless we assume that the stars could hardly be expected to shine in the sky. On the other hand, when line 7 is added, έμπρέποντας αίθέρ στέρας brings out clearly the fact that only certain conspicuous stars or constellations are meant—those (...) which serve as guides to the operations of agriculture and navigation, such as the Pleiades, Arcturus, and Orion, as we may see from Hesiod, Op. 609 onwards. (shrink)

Open peer commentary on the article “Homeostats for the 21st Century? Simulating Ashby Simulating the Brain” by Stefano Franchi. Upshot: Franchi argues that Ashby’s homeostat can be usefully understood as a thought experiment to explore the theory that life is fundamentally heteronomous. While I share Franchi’s interpretation, I disagree that this theory of life is a promising alternative that is at odds with most of the Western philosophical tradition. On the contrary, heteronomy lies at the very core of computationalism, and (...) this is precisely what explains its persistent failure to construct life-like agents. (shrink)

Traditional document clustering algorithms consider text-based features such as unique word count, concept count, etc. to cluster documents. Meanwhile, event mining is the extraction of specific events, their related sub-events, and the associated semantic relations from documents. This work discusses an approach to event mining through clustering. The Universal Networking Language -based subgraph, a semantic representation of the document, is used as the input for clustering. Our research focuses on exploring the use of three different feature sets for event clustering (...) and comparing the approaches used for specific event mining. In our previous work, the clustering algorithm used UNL-based event semantics to represent event context for clustering. However, this approach resulted in different events with similar semantics being clustered together. Hence, instead of considering only UNL event semantics, we considered assigning additional weights to similarity between event contexts with event-related attributes such as time, place, and persons. Although we get specific events in a single cluster, sub-events related to the specific events are not necessarily in a single cluster. Therefore, to improve our cluster efficiency, connective terms between two sentences and their representation as UNL subgraphs were also considered for similarity determination. By combining UNL semantics, event-specific arguments similarity, and connective term concepts between sentences, we were able to obtain clusters for specific events and their sub-events. We have used 112 000 Tamil documents from the Forum for Information Retrieval Evaluation data corpus and achieved good results. We have also compared our approach with the previous state-of-the-art approach for Router-RCV1 corpus and achieved 30% improvements in precision. (shrink)

This volume is concerned with the concept of rationality and the interrelations between rationality, belief and desire in the explanation and evaluation of human action. The book is conceived and structured to represent some of the most important general differences of approach to these problems, and also to connect them with problems about the relation of individual to social behaviour which are of central interest to historians, social theorists and economists as well as to philosophers. The essays have all been (...) commissioned for this volume and have not appeared elsewhere. The idea for the book arose from the meetings of philosophers and social scientists sponsored by the Thyssen Foundation, and is therefore a continuation of the informal series begun by C. Hookway and P. Pettit Action and Interpretation. (shrink)

Saint-Pierre's European Union, an alternative to the balance of power system and a safeguard against universal monarchy, was based on abolition of state sovereignty. Beyond the law of nations, the Union was to ensure European domination of the world and the use of the world's resources in Europe's own interest. A first step towards this goal was a universal crusade to ‘chase the Turk out of Europe and even out of Asia and Africa’. In this, Saint-Pierre followed the logic of (...) Western irenism. (shrink)

Next SectionDr Thomas Stockmann, the protagonist of Ibsen's play, An Enemy of the People, discovers a serious health threat in the Baths of his Norwegian town. The Baths have been marketed as a health resort to lure visitors. Dr Stockmann alerts officials about the problem and assumes that they will close the Baths until it is corrected. He is met with fierce resistance, however. His brother, the town's mayor, favors keeping the Baths open and correcting the problem gradually. He advances (...) multiple arguments that appeal to the economic interests of the town and Thomas's role-related obligation as a citizen. His wife, Katherine, wants him to cooperate with the mayor. She marshals several arguments that appeal to his obligations as a father. This paper reconstructs and examines the competing arguments, shows how Ibsen's play has both contemporary relevance and moral depth, and demonstrates how Dr Stockmann's responses can be interpreted as an argument that complying with his duties to protect the public health do not force him to renege on his core commitments as a parent and as a citizen. (shrink)

The Slovak political thought of the 19th century mingles with the nation-building efforts. According to the author the nationalists were one of the intellectual elites of Central Europe, which based their nation-building on ethnic ideology. This ideology embodied various elements, such as passive historicism, "prilepenectvo" and the will to become a historical subject. They made use of a non-political concept of nation as a language an cultural community, which gradually became politicized. The ultimate objective was the institutionalization of the nation, (...) defined originally non-politically. According to the author there are two ways of achieving this objective, conceived of as ideal types: the type A implies the institutionalization from above, based on an intervention of a power instance ; the type B implies the institutionalization resulting from gradual growth of national capacities in the political frame of Hungary of that time. These types correspond to different views of what is political activity. Nevertheless, the Slovak political thought of the 19th century did not go beyond the level of experimentation. (shrink)

Colour constancy refers to the ability to extract information about surface colours independently of illumination conditions. A ripe strawberry, for example, appears the same red when viewed under a blue sky or a reddish sunset. Since Land's pioneering work, discussion has centred on the issue whether colour constancy is achieved primarily in the retina or visual cortex. Recently, the debate has shifted to a consideration of the constraints imposed by various psychophysical tasks and instructions. Humans can judge illuminant colour, reflected-light (...) colour, surface colour, and the relationship between surface colours within a scene. Such observations suggest that colour constancy may not be a unitary phenomenon, and that its different aspects may be mediated at different levels in the visual system. Several questions therefore arise: are the tasks of surface estimation and illuminant estimation complementary, insofar as good performance in one implies poor performance in the other? How does retinal adaptation alter performance? Is colour vision tuned to the statistical composition of natural surfaces and illuminants? What role does colour-opponent processing in retina and cortex play in colour constancy? These and related questions are explored here in order to better understand what we mean when we ask: "Why do strawberries look red?". (shrink)