The power of form applied to geometric tracery : one hundred designs and their foundations resulting from one diagram (1851)
Billings, Robert William, 1813-1874 · W. Blackwood and Sons · leaf 57
XXVII. … This tracery is formed entirely of one secondary curve and the three inclosedcircles. Nos. 1. to 8. are therefore so many repetitions. xxvni.
Decoration and ornament · Geometry in art · Geometry in architecture · Architectural design · Form (aesthetics) · Geometrical drawing
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