A square plate dusted with virtual sand, bowed live. Each tone a plate can hold divides it into what moves and what stands still — the sand flees the motion and gathers along the nodal lines, drawing the Klangfigur, the sound-figure.
Sweep the slider to bend the frequency from figure (1,2) to (2,5). Strike to hear the mode it is drawing and scatter the sand. Hum holds the tone while you sweep — watch stillness migrate.