“…3 Zv 3 σ 0 = (1, 2, 3)(4, 5, 6) (7,8,9) (10,11,12) σ 1 = (1, 11, 9)(4, 8, 12)(7, 2, 6)(10, 5, 3) This is a lattice in R 2 if F is convex. For every sublattice Λ ⊂ Aut(F) the function F descends to a function on the torus R 2 /Λ and gives a tiling of this torus by black and white polygons.…”