Hypocycloid 

Hypocycloid Orbit Trap
Hypocycloid is a Fractal Science Kit fractal generator orbit trap based on a curve called the Hypocycloid described in: Eric W. Weisstein. "Hypocycloid." From MathWorldA Wolfram Web Resource. Options are provided to control the Center, Radius, Angle of rotation, the number of cusps (Cusps), the number of revolutions (Revolutions), and the size of the loop (Delta). If C is the number of cusps, R is the number of revolutions, and C and R are relative primes, then the Hypocycloid will have C cusps/loops in R revolutions inside the outer circle. See Polygon Options, Parallel Curve Options, and Trap Options for a description of the remaining options. See also: 
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