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A datum plane, subtly inserted just above the ground floor window level, attempts to tie MoMA’s episodic facades together.

Usually the contour has labeled on it in figures the height above some starting point, called the datum plane—generally sea level.

In all maps that are to be contoured some plane, called the datum plane, must be used to which all contours are referred.

The datum plane generally used in maps is mean sea level, hence the elevations indicated would be the heights above mean sea level.

Usually the contour has labeled on it in figures the height above some starting point, called the datum plane--generally sea level.