Modes in the square plate, in order (left-to-right) of
ascending frequency.
Modes in the circular plate; a node has been forced at a
point along the edge in the photograph at the right.
Modes in a violin-shaped plate.
The next rage for Father's Day gifts: the Chladni plate
tie.
This should replace the old tie-dye shirts and ash trays that
students used to make for their fathers as school projects.