a 220b Peter De jong Attractor inspired by http://paulbourke.net/fractals/peterdejong/
Demo: http://xem.github.io/miniPeterDeJongAttractor
HD version (279b): http://xem.github.io/miniPeterDeJongAttractor/big.html
Alternative version a.k.a. the one ring (223b): http://xem.github.io/miniPeterDeJongAttractor/alt.html
HD ring (281b): http://xem.github.io/miniPeterDeJongAttractor/big-alt.html
See also: http://github.com/xem/miniCliffordAttractor / http://github.com/xem/attractorandom