a demo of reverse phi movement (Anstis, 1970) Rings appear to rotate to and fro according to the change in luminance, though black or white arcs are stationary.pic.twitter.com/tOHYka6v3P
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Four-stroke reversed phi motion: Rings appear to rotate to and fro, though black or white arcs are stationary.pic.twitter.com/UHdZE2Ai8h
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Two-stroke reversed phi motion: Rings appear to rotate to and fro.pic.twitter.com/ATX7kIfJow
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A demo of possibly four-stroke reversed phi motion: Rings appear to rotate clockwise, though this movie consists of only four images.pic.twitter.com/qOwsSubmXS
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cf. Takeuchi, T. (1997) The motion analogue of the cafe wall illusion. Perception, 26, 569-584.
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