Cymatics, originally named 'Kymatik' in the title of Hans Jenny's books, is the study of wave phenomena. It is typically associated with the physical patterns produced through the interaction of sound waves in a medium.

A simple experiment demonstrating the visualisation of cymatics can be done by sprinkling sand on a metal plate and vibrating the plate, for example by drawing a violin bow along the edge, the sand will then form itself into standing wave patterns such as simple concentric circles.

The higher the frequencies, the more complex the shapes produced, with certain shapes having similarities to traditional mandalas and crop circle designs.