I'm used to seeing the cardioid-shaped region of the Mandelbrot set (what my students have sometimes called "the butt crack"), but also noticed it in my Spirograph program, where a family of graphs can be generated that seem similar to the paint can cardioids (or caustics):
You can get the same cardioid graph by drawing a cycloid around a circle of the same diameter (an epicycloid):
[...] the cardioid, whose name comes from it’s heart-like shape, there are some cool graphs out there that [...]
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