Day's Sine Illusion from Interactive Mathematics Miscellany and Puzzles

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Day's Sine Illusion

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Copyright © 1996-2010 Alexander Bogomolny

The vertical lines appear longer where the graph of sine is flatter. However all vertical lines are exatly same length.

References

A. Seckel, The Art of Optical Illusions, Carlton Books, 2002, #125

Copyright © 1996-2010 Alexander Bogomolny

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