The torus is found in everything from atoms, to life forms and even in all cosmic bodies such as stars and galaxies. It's a primary shape in existence.
The human aura appears as a series of nested torus formations around the body. Energy flows through the centre of the body and loops around to connect the feet and head.
The Torus explains a cycle - how something starts as a descent from spirit, through a central channel in one direction before it doubles back on itself, returning to its source. This process occurs in all objects in existence. When our human existence is functioning correctly, and we are cycling energy in a toroidal fashion, we are in balance, and are satisfied with our actions
(although we may be aspiring to achieve something, we are content with the process we are undertaking). 
These cycles help guide all things in the universe to work through an experience in a balanced, compassionate way in which both spirit and matter are in harmony.