physics's man on Instagram: "This works because of vibration-induced self-organization, a process driven by inertia, friction, and gravity rather than any hidden mechanism. When the box is shaken, the nails gain just enough energy to move, collide, and briefly lose contact with one another, while gravity constantly pulls them downward. Misaligned or crossed nails experience more collisions and friction, making those positions unstable. With every shake, friction dissipates energy and the nails r