Circle Illusion
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Without the lines, the dots create the illusion of a rolling circle. Showing the lines, you see that each dot moves in a straight line. The speed of each dot varies sinusoidally.
Contributed by: Carlo Miñon and Jonah Marie Tribaco (January 2015)
Open content licensed under CC BY-NC-SA
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"Circle Illusion"
http://demonstrations.wolfram.com/CircleIllusion/
Wolfram Demonstrations Project
Published: January 26 2015