It’s big, impressive and magically rich in details. The black holes are created by lining the inside of single barnacles with black lava sand. A cool piece of work.
Barnacles, black lava sand, cockles, scallops, clams, spider conch, nautilus, polished turbans, frogs, murex, Swedish oysters, mitres, olives, yellow neriths, shanks, sea urchins, hammerhead oysters, silver mouths, screw shells, etc
Inner rim: yellow nerites
Outer rim: cockles