Class 1: Fixed; all cells converge to a constant black or white set Class 2: Periodic; repeats the same pattern, like a loop Class 3: Chaotic; pseudo-random Class 4: Complex local structures; exhibits behaviors of both class 2 and class 3; likely to support universal computation

From the set of possible elementary CA rules, three rules were previously (manually) selected as examples for patterns of CA classes, with random initial condition.