 The ratio is similar to that of the growth patterns of many spiral forms that occur in nature such as rams' horns, nautilus shells, fern fronds, and vine tendrils and which were a source of decorative motifs employed by ancient Greek architects as particularly in evidence in the volutes of capitals of the Ionic and Corinthian Orders.The ancient Greek architects took a philosophic approach to the rules and proportions.The determining factor in the mathematics of any notable work of architecture was its ultimate appearance.