Planes might overlap or intersect with other planes, while the shape of an individual plane maintains its separate identity. Shapes thus created are less seen as singular forms, but more as plural or compound forms.
Two planes that have been combined might have some common edges, which result in a shape without easily discernible components.
[Wong, Wucius. Principals of Two-Dimensional Form. New York: Van Nostrand Reinhold Company, 1988.]
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