The torus is a very important geometric form as is shown in its ubiquitous appearance as electromagnetic fields at all scales from the subatomic to the supergalactic. It is the only stable standing wave in 3 dimensions which is why humans can blow toroidal smoke rings, and dolphins can blow toroidal bubbles.

Toruses are very much related to the dynamics of spin. A spinning sphere experiences expansive forces at its equator and contractive forces at its poles, and circulatory forces in its two hemispheres. This makes it appear energetically as a 'double torus'.