Dancing landscape using Chladni patterns

Based off the Chladni plate sand patterns produced by standing waves over a vibrating plate's surface. This can also be achieved using audio waves, even some examples use speakers. Other examples show these patterns in water.
Chladni Patterns are formed when sand settles at the nodes of two dimensional standing waves. Using the result of the formula I created height patterns showing a version of resonant frequency.
While not a simulation of this phenomenon, this still creates a fun and interesting pattern that evolves over time.
This effect was created using Houdini.