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Supverse
Filtered on: #Spirograph > showing 1 comment covering 100 days


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#Spirograph


Spirograph is a $geometric $drawing toy that produces mathematical $roulette $curves of the variety technically known as $hypotrochoids and $epitrochoids. It was developed by British engineer Denys Fisher and first sold in 1965
&neo 2014-06-30  


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