A Ulloa's Ring, sometimes called a Ring of Glory, is a conical rainbow; a complete set of circles of spectral color. It is formed at the edge of a cloud where, like an elusive target, it spins, weaves, bends and waves, always on the side opposite sunlight. The size, depth, and color intensity of a Ulloa's Ring can be seen from an airplane, in the mountains; any place one might be in the midst of clouds.