Spirals, however, are also sometimes utilized. There is no standard symbol for spirit, though circles are likely the most commonly used. Quintessence literally means 'fifth element.' Some people refer to this element as spirit. The curve shown in red is a conic helix.Ī two-dimensional, or plane, spiral may be described most easily using polar coordinates, where the radius r and k = 0. The Western system of five elements is composed of earth, water, air, fire, and quintessence. In the side picture, the black curve at the bottom is an Archimedean spiral, while the green curve is a helix.
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