people have been playing with sand for the longest time
Tibetan sand mandalas
and one of my favorite physics toys, the lissajou pendulum
which can make all sorts of cool patterns depending on how you urge the pendulum
The Structure and Dynamics of Waves and Vibrations by Hans Jenny
Cymatics - The Science of the Future?
Is there a connection between sound, vibrations and physical reality? Do sound and vibrations have the potential to create? In this article we will see what various researchers in this field, which has been given the name of Cymatics, have concluded.