In the indigenous world, “wheels” or circles have been used since the ancient times as tools for teaching the ways of the universe. Nothing is seen as linear, for the idea of linear is considered to be an illusion. There is no “beginning” or “end,” but simply a change of reference points.
Birth into physical existence is not the beginning of life (for spirit is eternally alive). It is a different perception point through which spirit experiences its aliveness.
It is simply movement in the wheel of life.