Upon a  far and distant world
where silicon's the key,
a great metallic turtle swam
through seas of mercury.

His eyes were red as copper,
and his mind was sharp as zinc;
he dined off silver fishes
and he sometimes paused to think.

"Supposing there's a world someplace
where carbon is the king?
Where seas are made of water,
and where fleshy turtles swim?"