It also symbolizes cyclic law. As the wheel turns the cycle returns again. Each cycle is symbolized by each turn of the wheel. All through Nature there is continual repetition of the cyclical law, as seen in the Wheel of the Year. As a symbol of Unity, it represents that which contains all things within itself.
Differentiation is caused by the energy going in two directions.
As long as Unity is preserved, the circular form must remain. Unity is formed by reason of the circling of forces around its center of gravity. The Circle is the form which energy assumes as it circles around its center of gravity. It is the figure of a whirl or spiral which forms the Universe. Thus it perfectly represents the first creative impulse the creation of a single form by a single idea, specific not general creation.