I love this little animated Ferris wheel.
Look at the red outside edge, is the wheel going around clockwise or counter clockwise?
Are you sure?
Now look at the purple center of the Ferris wheel.
What is the truth of this illusion?
By now you hopefully have realized that this is just a two frame animated GIF and it alternates back and forth between only two positions. It doesn't go around in either direction. This is clearly seen when you focus on the center but look just to the outside edge and it appears that this Ferris wheel makes complete trips covering the full 360 degrees.
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