Apparently, these two circles are rotating at the same speed.
, a Japanese experimental psychologist who studies visual illusions and creates his own illusion artwork, shared the post above on Twitter. The optical illusion shows two rings of shapes rotating counterclockwise. Kitaoka, who teaches at Japan's Ritsumeikan University, notes that"the right ring appears to rotate faster than the left one," and indeed it does.
So just what in the world of mind-bending optical illusions is going on? Well, this one appears to be all to do with phi phenomena. The Phi phenomenon is often used in a more narrow sense to refer to the illusion of movement in still objects that are illuminated quickly one after another, but there's a range of related phenomena. In this case, both objects are moving, but the change in contrast in the shapes in the ring on the right makes it appear to rotate faster.
Kitaoka's followers have been trying to figure it out."I think the change of colours feels like rotation so speed increases from our perspective," one person tweeted."I think the right ring resembles a much faster rotation visible through"gaps" in the actual one?" another person suggested. Yep, we're confused too, but we wouldn't have it any other way. For more gems like this, see our pick of the
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