The Colosseum opens: arch and concrete at civic scale

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The Flavian Amphitheatre is inaugurated in Rome. It is the arch and Roman concrete working together on a building rather than a bridge: an outer skin of arcaded travertine, radial and annular concrete vaults carrying the seating and the circulation, and a plan that can empty tens of thousands of people through arched exits. What it demonstrates is not span but organisation - the same structural unit repeated until it becomes a building type.

A node is not a place. Drawing it on a map would assert something about the world that no stored fact supports.