I find that the footstep illusion works even better in black and white. Ref. [S. Antsis and @AkiyoshiKitaoka]
http://anstislab.ucsd.edu/illusions/footsteps/ …pic.twitter.com/K9SbkjZdKE
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Not as good with two yellow squares, but still OK. I think the blue & yellow version makes sense when the squares cross the stripes in sync like in your version of Stuart Anstis's anim. https://twitter.com/InertialObservr/status/1225508300290248710?s=20 …pic.twitter.com/uB2n7UZNXa
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