Someone could read this and think that you can hallucinate apples but they're grey. The problem with the whole discussion is that
- some people can actually hallucinate at will
- some people can't hallucinate, and interpret the images as rough abstractions for sort of recalling the visual qualities of objects
- some people can't hallucinate, and interpret the images as hallucinations other people literally see
- some people can't remember what a thing looks like if they aren't looking at it
It's very hard to figure out who a given person is, because they're all like "I can see things" and "i can't see things" and it's meaningless