Strick Attractor

The Strick attractor is a 2-dimensional attractor produced by the following equation:

xn+1 = { (2-a ) xn -b yn , if | xn |<0.5 a xn -b yn +(1-a)sign( xn ), otherwise yn+1 = { -b xn +a yn , if | xn |<0.5 b xn +a yn -bsign( xn ), otherwise
Strick attractor