The Oceanโs Greatest Geometric Sculptor
For decades, divers off the coast of Amami Oshima in southern Japan were baffled by massive, 6-foot-wide circular geometric mandalas etched into the seabed sand. In 2012, researchers finally discovered the artist: a tiny, 5-inch White-Spotted Pufferfish (Torquigener albomaculosus).
โWorking around the clock for 7 to 9 days without rest, the small male sweeps his fins across the seafloor, carving concentric sand peaks and circular trenches that channel water currents toward the center.โ
Sand Art for Courtship
The finished circle serves a functional purpose: the radial trenches channel ambient water currents toward the center, protecting deposited eggs from strong seabed surge. The radial grooves reduce ocean bottom currents by 25% at the center of the circle, creating a calm, protected nesting zone decorated with cracked seashells to shelter fertilized eggs.
