Chladni figures are the standing-wave nodal patterns that appear when a flat plate is driven at a resonant frequency: loose sand bounces off high-amplitude antinodes and settles along the still nodal lines, tracing the eigenmode shape. This simulation approximates each (m,n) eigenmode with the classic z(x,y) = cos(nπx)cos(mπy) − cos(mπx)cos(nπy) function, evaluated per-particle every frame to compute a numeric gradient that pushes 9,000 sand-like points down-slope toward the nodal lines while jitter proportional to local amplitude keeps unsettled grains bouncing.