 In his 1995, Tye attacks experience-conceptualism using the example of determinate color properties, which he says can be represented in experience even by subjects who lack concepts of them. A similar point is made by Raffman (1995) who discusses evidence that humans perceptually discriminate more shades of color than they remember and have concepts of. It is supposed to be independently plausible that the discriminated shades are represented in experience; so if the subjects really do lack concepts of them, then experiential conceptualism is false. A similar line of thought is hinted at by Evans (1982), who asks (apparently rhetorically) “Do we really understand the proposal that we have as many colour concepts as there are shades of colour that we can sensibly discriminate?” (229).