There are many spiral forms in nature, both on Earth and in space. Spirals occur in physical forms such as DNA and the shell formation of mollusks such as the conch and chambered nautilus. They also occur in wind patterns, including hurricanes and tornadoes. They are present in air and flame forms known as vortexes and whorls. And they occur in the way things fall in the atmosphere, from leaves to aircraft. In the human body, the spiral pattern of the heart's bioelectric impulses causes the chambers to beat with a spiral pulsing rhythm. Brain waves, comprised of neuron impulses, seem to flow along the neurons and down the spinal cord in a spiral pattern. Some evidence shows bioelectrical spiraling in the labor impulses during birth. Finally, we see spiral forms omnipresent throughout the visible and invisible universe, in galaxies, accretion disks around black holes, coalescing interstellar clouds and many other forms of matter and energy.
