The famous Lorenz butterfly, or Lorenz attractor. The O.D.E. used here is:
x' = s(y-x),
y' = x(r-z)-y,
z' = xy - bz,
b = 8/3,
s = 10,
r = 28,
x0 = 63.32,
y0 = 4.28,
z0 = 6.47,
0 < t < 6.
Custom ODEs available upon request! Also, don't forget to buy a stand for your model too! https://www.shapeways.com/model/73321/lorenz_attractor_stand.html