While diving in the semi-tropical region of Amami Oshima, roughly 80 ft below sea level, Ookata spotted something he had never seen. And as it turned out, no one else had seen it before either...The lower embed shows how small the fish is in comparison to his artwork. I've seen tiny little scooped-out nests in the sand made by freshwater fish, but never anything this elaborate. It reminds me of the creations of bower birds.
On the seabed a geometric, circular structure measuring roughly 6.5 ft in diameter had been precisely carved from sand. It consisted of multiple ridges, symmetrically jutting out from the center, and appeared to be the work of an underwater artist, carefully working with tools...
Photos and text from Spoon and Tamago, via BoingBoing.
Reposted form 2012 to add this video of the puffer fish creating his artwork: