Yeats' Hourglass-small

This set of four intersecting spiraling wave forms was inspired by W. B. Yeat's diagrams of intersecting spirals and his diagrams of them. In this version, the cones are replaced by the Sine and Cosine functions to make a smoother shape, and the spirals are replaced by 10-sided tubes of constant radius. In Yeats' cosmology, these spirals represented the intersecting worlds of spirit and matter,the unmanifest potential, and manifestation in time. The Sine and Cosine curves also describe to vibrations of all sorts, whether electromagnetic waves, sound waves, spring motion, or the path of a pendulum, and so seem far more universal than cones.