ocr: buildings are oriented to the grid, even when they were built on slopes that ran counter to it. A small design composed of concentric circles divided into quadrants may have served as a standard surveyor's mark; it is sometimes pecked into the floors of buildings and sometimes into bare bedrock. One such pair of marks, two miles apart, forms a line exactly perpendicular to the city's north-south axis. The achievement ofthis kind oforder obviously calls for an initial vision that is both audacious and self- confident. Ac city planner's description of Teotihuacan would begin not with the 140f42 ...
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