Yu Tian

Drop a stone into a pond — the ripples spread and fade away. A black hole, after colliding with another hole or a star, also 'rings', but its oscillations are not simple. Near the hole, 'overtones' sound — secondary waves born from the nonlinearity of spacetime itself.

A figure skater glides across the ice, gradually approaching the center of the rink. A slight twist of the torso, and the smooth spiral breaks, the trajectory becomes unpredictable. Something similar happens when a small black hole with its own rotation (spin) falls toward a giant black hole.