These rituals sometimes involve treks into the wilderness where the seeker fasts and or engages in other activities likely to bring on visionary experiences. Angels are often pictured wearing white robes, halos, seated on white clouds and playing heavenly music on harps. Harps may have been chosen as the heavenly instrument because of the association between the Greek gods and the lyre, a harp-like musical instrument popular in ancient Greece. The halo is often drawn around the heads of religious figures such as saints and angels. Artists tend to draw halos as thin circles of light that float over the subject's head, but they were traditionally drawn as disks of gold - meant to imply a sphere of light radiating in every direction from the figure's head.
Halos symbolize holiness, innocence, and sometimes spiritual power.
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