Anonymous ID: 43614c Jan. 6, 2020, 8:38 p.m. No.7737929   🗄️.is 🔗kun

>>7737899

 

"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."