 Regarding Locke, a perusal of the Essay, bk 2, ch. 8, reveals that he is not clear on the matter. Interpreters find two notions of “sensory ideas” in Locke: as objects of perception that might potentially instantiate color and shape, and in that way be like sense data; and as acts of perceiving that might exhibit color and shape only by way of representation (Yolton 1984: ch. 3), understood here to mean nonconceptual intentional content (see  note 7).