Visual Illusions Again

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!