![]() ![]() Obviously, its development is intertwined with the gradual spread of the grid as a drawing and design system, whose origins are here associated with the quincunx, a pattern that passed through different ages and cultures of Western world. ![]() As in the game, in which the grid is quickly drawn before positioning the marks, modern architects have often adopted a similar approach and scheme as a sort of opening move in order to get a new project started. The result is that the grid, filled with crosses and circles, ends up resembling the plan of a quincunx church, a quadrangular building featuring an internal division in nine cells vaulted with domes or cross-vaults (Fig. In the paper version, still practiced today by children, each of two players alternatively marks either a circle or a St Andrew’s cross in one of the nine boxes, trying to put three in a sequence. In ancient Rome, where people used to practice it onto the marble steps of theatres and arenas, it was named terni lapilli, for it consists in sequencing three pebbles ( lapilli in Latin) inside a square grid of nine boxes. ![]() ![]() The game of tris or tic-tac-toe is widespread throughout the world. ![]()
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