[무리] 그림자가 지나가면 갯벌이 빕니다

Thousands of small fiddler crabs on a wide Korean tidal mudflat at low tide, seen from a low angle across the glistening grey mud, each crab waving one bright orange claw. First 2 seconds: the whole field of claws waves in a loose rhythm. Next 2 seconds: a cloud shadow sweeps across the mudflat from left to right and, in a wave that follows the shadow's edge, every crab vanishes into its burrow. Final second: the mud lies empty and dotted with holes as the first claws cautiously reappear behind the shadow. No individual crab is followed. Faint clicking and bubbling mud sounds. Bright afternoon light, static locked-off camera