From a referring article[1] which translates into a human-understandable format,

"Interestingly, the same kinds of harmonic waves are thought to explain other self-organising phenomena in nature, such as the patterns that sand forms when sitting on a vibrating metal plate, or the development of biological patterns such as the stripes on tigers and spots on leopards."

[1]http://www.sciencealert.com/resting-brainwaves-function-in-s...