This is a mug shaped like a topless mermaid posing in front of a giant upright clamshell with the clamshell forming most of the vessel.

From LowTiki:

"Hand-sculpted, cast, and glazed in studio in the Pacific Northwest.

Super limited run of 15 mugs. This colorway will not have another edition.

The Mermaid mug measures approximately 7 inches tall and 6 inches wide and holds about 16 oz of liquid.

Each mug is done by hand so expect some variation."

Also produced in a light brown & blue wipe edition.