The fact that people have such different experiences and report them with such confidence, for the very same image, is compelling
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evidence that our perceptual experiences of the world are internal constructions, shaped by the idiosyncrasies of our personal biology and history. Most of the time, we assume that we each see the world in roughly the same way, and most of the time perhaps we do. But even if this is so, it isn’t because red chairs really are red, it’s because it takes an unusual situation like The Dress to tease apart the fine differences in how our brains settle on their perceptual best guesses.