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gowld
on June 15, 2019
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All the balls are the same color: brown
If you look at each ball one at a time, it's obvious that each is brown. The effect only works if you look at the balls with your peripheral vision and then make a summary judgement.
phs
on June 15, 2019
[–]
I'm zooming in on one pair until each is about one hand-width in diameter. The effect is still present for me.
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