Rainbow String Figures
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If the lines cross, the edge of the region is a rainbow curve. The lines sometimes look like a twisted band. Drag the locators to change the pattern.
Contributed by: Joe Bolte (March 2011)
Open content licensed under CC BY-NC-SA
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"Rainbow String Figures"
http://demonstrations.wolfram.com/RainbowStringFigures/
Wolfram Demonstrations Project
Published: March 7 2011