Wednesday/ ready to draw hypocycloids

Alright!
My new set of Spirograph has arrived, and I’m ready to draw up a storm of hypocycloids: the lines formed when tracing a point on a disk, while running it inside a circle.

The red tray below has the original classic 1967 Spirograph set. The green ring is from the new ‘Shapes’ set. The ‘Shapes’ set comes in a cheapy hexagonal box and it has putty to fix the rings to the paper (yuck) instead of pins. I’m old school, and I still prefer the pins. I suppose in 2019, parents will sue the toy company if kids stick the pins in their fingers, or in their siblings!

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