ABSTRACT
Such an argument seems to flow from a certain defect in Locke's official position. He treated sensory effects or ideas, for the purposes of his theory, as 'simple and unmixed', but as perceived to 'coexist'. Yet the coexistence of qualities in an object cannot just be a matter of the co-occurrence of their effects in the mind: the one is neither a necessary nor a sufficient condition of the other. We characteristically perceive the 'coexistence' of sensible qualities as coexistence at a place, or rather as features of some space occupant located through its spatial relations to ourselves. Not that every perceived sensible quality is always immediately perceived as being at the location of its possessor.
