Experiment № 014 · The story
Chladni Plate
Why I picked it
In 1787 Ernst Chladni would scatter sand on a metal plate and draw a violin bow across its edge, and audiences gasped as the grains leapt into clean geometric figures that changed with every note. Napoleon was so taken with it he funded a prize to explain it. I'd built waves before in this collection — a ripple tank, a harmonograph — but those show waves moving. Chladni figures are the opposite: they make visible the parts of a wave that never move. I wanted to render the stillness inside motion.
What I enjoy about it
The whole image is governed by one tidy formula for a square plate — a sum of two cosine standing waves keyed to the mode numbers m and n. Where that sum equals zero, the plate sits perfectly still; everywhere else it shakes. So I just let thousands of grains wander, nudging each one down the steepest slope of the vibration toward the nearest quiet line. Bump m or n by a single notch and the entire pattern reorganises into something unrecognisable — grids, stars, lattices, mandalas — yet always crisp and symmetric. It never stops surprising me how much variety hides in two integers.
Something you might take away
The sand doesn't draw the loud part of the wave — it draws the silence. Every figure you see is a map of where nothing is happening. It's a good reminder that structure often lives in the gaps: the rest between two notes, the pause in a sentence, the still points a busy system organises itself around. Sometimes the clearest signal is the shape of the quiet.