Penguins standing guard on human skulls. This was inspired by the inherent risks of adventure sports. People going to extreme places and risking their lives for adventures. In Antarctica a human is at the edge of survival but a Emperor Penguin is right at home. These penguins stand sentinel, guarding their realm.
On the other hand a penguin standing on a skull is just a fun design. Like any art the meaning is in the eye of the beholder.
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