Sacred Geometry - Circles
The medicine wheel represents the sacred circle of life, its basic four directions, and the elements. Animal totems serve as guardian of each of the directions.
Sacred Circle Card Spread
This is a divination card layout that will give you insight into your physical, emotional, mental, spiritual bodies.
Here's a splendid pictorial essay on The Wheel of Fortune, the Rose Window, Dancing Shiva and other instances of the circle in fine art.
From a Theosophical interpretation the circle denotes unity. It has no beginning or end. It is boundless.