We now pass from the circle to the spiral,[5] from which a great part of ornamental forms are derived.
[Fig. 41] is an Egyptian wave scroll, and 42 is the familiar Greek wave. [Fig. 43] is from an Egyptian ceiling; all these contain the spiral as their chief characteristic. [Fig. 44] shows two intersecting meanders,
Figs. 37 to 40.—Ornaments mostly derived from the circle.
47 is a scroll intersected by a meander, 46 is an eccentric meander, 45 is the scroll or antispiral of the cyma recta, and 48 is the double spiral of the cavetto decoration. [Fig. 70] is the ornament on the Greek cyma reversa or ogee, called by the French rais de cœur; 71 is a Roman variety.
Figs. 41 to 48.—Ornaments chiefly based on spiral curves.
[Fig. 50] shows the anatomy or centre lines of the purely æsthetic Greek pattern developed at [Fig. 49]. Figs. [51] and [52] are additional examples. [Fig. 53] is one of the scrolls, and in [Fig. 54] is shown the irregular meanders and spiral curves forming the stand for the tripod on the roof of the choragic monument of Lysikrates.