Some frequencies manifest on the plate in a standing wave, which makes it vibrate more in some places than in others. In the dormant areas on the plate, the sound draws beautiful symmetric patterns as the sand comes to rest there. Less motoric sensitivity is needed for the Chladni box, whose plate is stimulated by a loudspeaker instead of a violin bow. Certain sounds were chosen beforehand and could be played at the touch of arcade buttons. The fluorescent sand first jumps wildly on the dark plate, until after a few seconds clear, shimmering lines appear.