"And how many hours a day did you do lessons?" said Alice, in a hurry to change
the subject.
"Ten hours the first day," said the Mock Turtle: "nine the next, and so on."
"What a curious plan!" exclaimed Alice.
"That's the reason they're called lessons," the Gryphon remarked: "because
they lessen from day to day."
-- Lewis Carroll, "Alice's Adventures in Wonderland"