“When we were little,” the Mock Turtle went on at last, more calmly, though still sobbing a little now and then,” we went to school in the sea. The master was an old Turtle—we used to call him Tortoise—”
“Why did you call him Tortoise, if he wasn’t one?” asked Alice.
“We called him Tortoise because he taught us,” said the Mock Turtle angrily. “Really you are very dull!”
“Most people would find the picture of our universe as an infinite tower of tortoises rather ridiculous, but why do we think we know better? What do we know about the universe, and how do we know it?”