Polygonal String Art
Polygons in polygons, turning, turning...
Inspired by a mathgif from gugo torelli:
http://gugo-torelli.tumblr.com/post/77909174796/008-more-geometry-experiments-one-sketch-a
In this sketch:
n controls how many rotations around the center,
m controls the number of sides of the inner polygon,
t animates the turning of those polygons and
d controls the ratio of the side of the inner polygon to the outer polygon.
Gugo's gif has n=m and d=.5 for some quite lovely designs.