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The Mueller Illusion
The Mueller illusion is an artifact of our visual system that we evolved to be very good at using lines as information for detecting edges and estimating the sizes of things in our environment. But it also means that as a consequence of having evolved that kind of visual system, when we have this kind of stimulus in front of us, we see it wrong. I think that the illusion that we're selves is a cognitive illusion like that. It comes along for the ride because they were inelimitable features of systems that are otherwise pretty good. And then if you erase the arrowheads, the lines go back to looking equal.