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>Everyone falls for this illusion across all countries and cultures, so much so that folks hypothesized it is affected by our biology. Well, until some anthropologist showed it to some African tribesman. It turns out they were not susceptible to that form of illusion at all. It is unclear why.

That was disproven. This is scientific racism/bio-essentialism. Let's not go there, it's an evil path.

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Ah. I don’t see where it was disproven. The Wikipedia article about it seems to indicate the difference in perception between various populations was further substantiated.

My contention nor original researchers, so far as I can tell, claimed the difference was based on race or biology. It looks like they thought it had to do with the presence of rectilinear buildings, thus cultural.

Some subsequent research did hypothesize eye pigmentation played a role and that was disproven. However, as far as I can tell, different groups of people have differing abilities to perceive illusions.

Moreover, my fundamental point was that culture affects thought, and a variety of thought is valuable. Do you dispute either of those points?

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