Abstract

I argue that philonous gives two versions of the argument from perceptual relativity--One for the secondary qualities and another for the primary. Further, Both versions ultimately turn on the epistemological assumption that every case of perceiving, Regardless of the conditions of observation, Is a case of "knowing" the character of some "object". This assumption is made in order to avoid a vicious regress that arises when one tries to understand how perceptual knowledge is possible