1D Sliding
The 1D analog of the unidirectional sliding model: two layers of spins on a ring, one
sliding right and the other sliding left at velocity V, updated by asynchronous
single-site heat-bath votes. White = both layers agree on 0, black = both agree on 1,
grey = the layers disagree.
The current state of the system is the top row, and lower rows are the history.