Tortoises and Lizard migrate across their world from right to left. The two creatures have different modes of migration, the tortoises branch out as they wander and fan out across the top of their world, forming many paths, while the lizards branch in to a single path along the base. Migration I is a substitution tiling of the tortoise, there are 7 x 7 x 7 tiles = 343 creatures plus the 4 escaping from the start and the end.

Migration II is the corresponding version substitution of the lizard. In it, the creatures are all migrating back again, from left to right, interestingly in both versions they maintain their habits, tortoises branching out, lizards merging into a single stream, despite taking over each other’s territory.

The two prints make a lovely pair, as at first they seem to the same, or a mirror image, only slowly do you see that they are complementary but different in intriguing ways.