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I read Stacy's post on how one might find it disturbing that what we see is not necessarily what is actually there, and I had a somewhat different take on this concept. I feel that the fact that the brain fills in a red dot for a yellow dot or whatever, is not a problem because that isn't what is actually there, but rather an amazing ability of the brain to make up for a small flaw in the visual system. There's no way to get around the fact that the optic nerve has to get to the retina and then to the brain somehow, and as a result, there is a sopt with no photoreceptors. I am so grateful to my brain for filling in a red dot where there is actually a yellow dot because if it did not have this capability, how annoying would it be to have a blank spot in your line of sight?  I am much less disturbed by this so-called false reality the brain creates than I think I would be if I had a black hole in the middle of everthing I looked at with one eye closed.