In the Worms and serpents blog I reminded myself of the need to illustrate a truly labyrinthine Serpentine Lattice Labyrinth – so here are just five supertiles of an example. I’ve picked out one of the five in green. Each supertile consists of 425 square tiles. These serpents are FORKED and, like all members of their Labyrinth family, look the same viewed from either end – maybe I should have named them after the traditional British reversible tramcar, as still to be seen on Hong Kong Island and at Crich Tramway Village (pop down to Scarthin Books while you’re there). Resist following those links, they’re a digression.The little squares and lozenges are tetrad and dyad axes of symmetry, applying to the shape (neglecting colouring) of the infinite tessellation of which this is part. See the rotational symmetry blog post for the meaning of these and other rotational symmetry axes.