This must involve the pathways by which our conscious cognition guides our visual attention, mixed in with the native operation of the visual cortex. Astonishing.https://twitter.com/jagarikin/status/1137536097112666113 …
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Many followers, doing something obvious which I usually do (but did not do this time -- namely, conduct a basic experiment) have noted that when you cover the directional cues with a finger, the illusion continues to work. So it's a trick (probably involving the perimeter).
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The illusion is caused by the lighting patterns of the perimeter, and can be seen easier with this GIF, if a pointer is set at any one of the points of the diamond.https://twitter.com/agshapiro2/status/1135286867182706688 …
