Abstract
Körner has made an important distinction between dependent and independent particulars, noting that any adequate theory of categories will divide particulars into those that are independent and those that are not. In the present paper, the concept of a spatial boundary is used to illustrate the concept of a dependent particular. It is suggested that, if we follow Brentano and think of such boundaries as ontologically dependent upon the things of which they may be said to be boundaries, then we will be able to throw light upon a number of philosophical questions about the spatial continuum. These questions pertain to such topics as: the distinction between parts and boundaries; the definition of dimensionality; and the nature of contact and physical continuity.