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A fishbone pattern in a rectangular frame is superimposed by a rhombus. Adjust the rhombus until you think it has become a square, then check your selection by showing an accurate square. Even the rectangular frame seems to be distorted.
Contributed by: Sándor Kabai (September 2008)
Open content licensed under CC BY-NC-SA
Wolfram Demonstrations Project
Published: September 25 2008