via Mighty Optical Illusions http://www.moillusions.com/2013/08/lean-back-and-forth.html
Usually when I skip few days of posting stuff, I tend to blame it on bad internet connection. This time however, it was just me being irresponsible – mostly relaxing and enjoying my summer vacation. I just hope you won’t take it against me. Continuing with old-school optical illusions, here’s another simple one – concentrate on the central cross, while leaning back and forth repeatedly. Do the concentric circles seem to rotate in opposite directions?
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