As Mart says, it's the base of kelp fronds, often has a big air filled globe, used to enjoy going around stamping on them as a child.
The skin on them isn't that thick so not sure they'd be very good for the purpose, though they may toughen up if dried out? Doubt they would sit like a bowl too well without some careful carving, scallop shells would make a better piss bowl allround.
The skin on them isn't that thick so not sure they'd be very good for the purpose, though they may toughen up if dried out? Doubt they would sit like a bowl too well without some careful carving, scallop shells would make a better piss bowl allround.