The upper left pattern was the highest scoring pattern picked from a randomly generated family and the computer chose the best of each family for several generations until the final pattern was settled where the evolution halted due to the pattern's superior fitness. Smoother grays can be obtained for this particular density but the lineage shown below demostrates an adaptive peak from which the evolution of this pattern could not escape. Thus, the final pattern may not be the most fit pattern that could evolve, but within its lineage it could go no further. A different path to the top would have to be found, as it were. Pattern Evolver is freeware and will run on any Macintosh computer.
Extensive documentation is included.