An imaginary straight line that divides any space or figure into two portions. Axes in diagrams take a cue from their mathematical use as reference line for coordinate hierarchies of cause and effect. Thus, in diagrams, multiple axes can identify the interrelationships of movement, SPATIAL HIERARCHY and grain.
Source: J. Balmer., M.T. Swisher. Diagramming the Big Idea: methods for architectural composition.
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