Spirographs are images generated by having a small cog rotate inside a larger one. Mathematically, this can be parameterized using the sums of trig functions. Any calculus student (given the desire and patience) could write down the equations. I’ll hopefully do some examples in Mathematica for y’all in a few days.
Remembering Woodstock, 44 Years Ago
I came upon a child of God
He was walking along the road
And I asked him, “Where are you going?”
And this he told me…
I’m going on down to Yasgur’s Farm,
I’m gonna join in a rock and roll band.
I’m gonna camp out on the land.
I’m gonna get my soul free.
The Woodstock Festival began 44 years ago today.
Ah Woodstock. Wish I were there.
(Source: , via thateventuality)