VSS is the Vision Science's Society conference that's held every year in Naples, FL. I couldn't make it this year, but they have a contest for the best new visual illusion that's usually a pretty good show; illusions are getting cleverer.
This is this year's winner:
There's actually visual information that something is wrong that's available before they rotate the display - 5 internet points to anyone who points it out!
2 things: unequal rolling time, and lighting/shading
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