The animation below shows a +/-J random-bond Ising model on a 4x4
lattice being reduced by the bond-propagation algorithm.
The
legend on the right shows the color scheme used for the
bonds:
red=ferromagnetic, cyan=antiferromagnetic, other
colors=complex bonds.
See cond-mat/0610822 for details. (Actually the simulation shown above uses an even better version of the algorithm than that described in the paper.)