A single taut string across the tile. Drag to grab and pull it into a triangle, then release: a six-mode standing-wave synthesis rings the string out — y(x,t) = Σ Aₙ sin(nπx) cos(ωₙt) e^(−t/τₙ) — with modal amplitudes set by the pluck point, so plucking near an end brightens the harmonics. Motion-blur ghosts smear at the antinodes, faint node markers dot the centreline, and a soft bloom pulses with the string energy. Left alone, a virtual hand plucks at varied spots like a slow melody.