The adherents of this early form of scientific philosophy regarded fire as the central element. It is considered both unifying and stabilizing force, and most alchemical practices begin and end with fire. It is symbolized by an upward-pointing triangle, signifying rising flames, and hence solar power and life. In alchemy fire is contrasted with water. The element of fire symbolized by the salamander and the head in a three dimensional representation of the icon of fire: a triangle.