Hambidge, Jay, 1867-1924 · New Haven : Yale University Press · leaf 48
7, is 1.809. BC is .809, CD is .309, AC is 1 or unity, and AD is unity minus .309, or .691. This fraction .691, is the reciprocal of 1.4472, or a square plus a root-five rectangle. ED is this shape, the key to the Parthenon plan and many other Greek designs. It is a favorite shape for many vases.… … Fig. 8. The distance AB in Fig. 9, is the difference between 1.809 and 2, or .191, and this fraction multiplied by 2 equals .382, the reciprocal of 2.618. Therefore the area AD is composed of four shapes, two squares and two whirling square rectangles. Fig. 9.
Design
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![An illustration from Preclarissimũ opus elemento[rum]](https://img.insideoutlibrary.com/img/200/ia-gri_000033125009354198-52-2.webp)
