Context Free Art - 10
derived from http://www.contextfreeart.org/gallery/view.php?id=2165 & http://www.contextfreeart.org/gallery/view.php?id=256
Variation: LZW
startshape main size {s 1 1} rule main { 20 * {h 18} aa {a -1 b .7 sat .3} } rule aa { CIRCLE {} aa {a .00001 r 12 x .1 s .999} } rule aa { CIRCLE {} aa {a .00001 r 11 x .2 s .999} }