Selected Bibliography Architecture - Form Space and Order | Page 363

SYMME TRY

While an axial condition can exist without a symmetrical condition
being simultaneously present, a symmetrical condition cannot
exist without implying the existence of an axis or center about
which it is structured. An axis is established by two points; a
symmetrical condition requires the balanced arrangement of
equivalent patterns of form and space on opposite sides of a
dividing line or plane, or about a center or axis.

There are two fundamental types of symmetry:
1. Bilateral symmetry refers to the balanced arrangement
of similar or equivalent elements on opposite sides of a median
axis so that only one plane can divide the whole into essentially
ident