A circle is one of the oldest geometric shapes, a sign of the sun, moon, and stars; it is a symbol of infinity, cyclicality, and unity, however, at the same time, it symbolizes completeness. Often the beauty and ideality of a circle are associated with its symmetry and continuity. A circle is a projection of a sphere, which is a harmonious natural shape, onto a plane. A circle is not just an abstraction, but a very real form that people consciously give to objects inspired by natural formations and parts of living organisms of the same form.