The Mexican game of tlachtli symbolized the movements of the moon (but more probably of both sun and moon). This, perhaps the favourite Mexican amusement, was a ball-game, played with a rubber ball by two persons one at each end of a T-shaped court, which in the manuscripts is sometimes represented as painted in dark and light colours, or in four variegated hues. In several of the MSS. Xolotl is depicted striving at this game against other gods. For example, in the Codex Mendoza we see him playing with the Moon-god, and can recognize him by the sign ollin which accompanies him, and by the gouged-out eye in which that symbol ends. Seler thinks “that the root of the name olin suggested to the Mexicans the motion of the rubber ball olli and, as a consequence, of ball-playing.” It seems to me to have represented both light and darkness, as is witnessed by its colours. Xolotl is, indeed, the darkness that accompanies light. Hence he is “the twin” or shadow, hence he travels with the sun and the moon, with one or other of which he “plays ball,” overcoming them or losing to them. He is the god of eclipse, and naturally a dog, the animal of eclipse. Peruvians, Tupis, Creeks, Iroquois, Algonquins, and Eskimos believed him to be so, thrashing dogs during the phenomenon, a practice explained by saying that the big dog was swallowing the sun, and that by whipping the little ones they would make him desist. The dog is the animal of the dead, and therefore of the Place of Shadows. [331] Thus also Xolotl is a monster, the sun-swallowing monster, like the Hindu Rahu, who chases the sun and moon. As a shadow he is “the double” of everything. The axolotl, a marine animal found in Mexico, was confounded with his name because of its monstrous appearance, and he was classed along with Quetzalcoatl merely because that god’s name bore the element coatl, which may be translated either “twin” or “snake.” Lastly, as he was “variable as the shade,” so were the fortunes of the game over which he presided. At the same time he seems to me to have affinities with the Zapotec and Maya lightning-dog peche-xolo [332] and may represent the lightning which descends from the thunder-cloud, the flash, the reflection of which arouses in many primitive people the belief that the lightning is “double,” and leads them to suppose a connection between the lightning and twins, or other phenomena of a twofold kind. As the dog, too, he has a connection with Hades, and, said myth, was dispatched thence for the bones from which man was created.