sea/mless

He had bought a large map representing the sea,
Without the least vestige of land:
And the crew were much pleased when they found it to be
A map they could all understand.

Other maps are such shapes, with their islands and capes!
But we've got our brave Captain to thank:
(So the crew would protest) "that he's bought us the best —
A perfect and absolute blank!"

Lewis Carroll: The Hunting of the Snark (An Agony in 8 Fits)