What would happen if these were constrained to run inside irregularly shaped "skins" and bred for "fitness" against some criteria. For example, take a look at M

What would happen if these were constrained to run inside irregularly shaped "skins" and bred for "fitness" against some criteria. For example, take a look at Marsaglia's die hard tests for statistical randomness. Any machine that terminates would have a very low random coefficient, and any that turns to noise would have a very high random coefficient. Similarly, ones that repeat quickly could also be selected against. All that remains is to restrict the number of critters, as specified by the number of "skins" and "breed" new critters from old ones which were successful (with a "pleasing" statistical randomness coefficient).