 As noted above, the second pillar in the foundation of the view that qualia are intrinsic, nonrepresentational properties of experiences is the common kind assumption. Those philosophers who accept this assumption see it (in the perceptual case) as providing the simplest, best explanation of the fact that hallucinations and veridical perceptions sometimes seem exactly alike to their subjects. It is granted, of course, that it does not follow that there is something common between hallucinations and perceptions in such cases from the fact that they seem alike. Nonetheless, it is a challenge to those who reject this assumption (see section 9) to provide a better explanation.