attractor/13 Tinkerbell Map (stop_motion)

Description

> a = 0.9, b = -0.6013, c = 2.0, d = 0.5, > x0 = -0.72, y0 = -0.64, ``` def tinkerbell(a, b, c, d): return lambda x, y, z: ( x*x - y*y + a*x + b*y, 2*x*y + c*x + d*y, 0 ) ```