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Then explain the half-dozen entirely different vision systems extant right now? They are very different; they have all been under selective pressure.

It would be interesting to see if they all succumb to the same kinds of illusions. I guess the important question is whether these illusions are arbitrary and reflect arbitrary choices by evolution, or if they are fundamentally hard and would be hard for any hypothetical vision system. My hunch is that they are fundamentally hard.

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