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Length of Line Illusion
Can your eyes deceive you? Adjust the length of the upper red line until you think its length is equal to that of the lower red line. Then check your selection by rotating the top red line to the lower one.




"Length of Line Illusion" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/LengthOfLineIllusion/
Contributed by: Sándor Kabai
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