An Illusion of Spin


I used three things to make this: Geometer’s Sketchpad (to make one black and white version; the whole thing is made of semicircles), MS-Paint (to color the six different versions which appear here), and the website (to assemble the six separate still images into one .gif file, with the illusion of motion). The surprising thing to me was how fast the process was, once I had the idea of my goal for a finished product.

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I go by RobertLovesPi on-line, and am interested in many things, a large portion of which are geometrical. Welcome to my little slice of the Internet. The viewpoints and opinions expressed on this website are my own. They should not be confused with the views of my employer, nor any other organization, nor institution, of any kind.

4 thoughts on “An Illusion of Spin”

    1. Hello Κώστας Λαμπρινίδης and Robert,

      Both of your “spinning wheels” are very nicely done!

      Hi Robert! Do you know why your “wheel” appears to spin clockwise only and not counter clockwise?

      Do you know what kind of optical illusion this is? I would like to classify it in my special post published at

      In the post, I have included a List of Optical Illusions in a very large table. In your opinion, what kind of Optical Illusion(s) listed there is likely to be operating in your illusory “spinning wheel”?


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