signifying.nothing

"You are old, Father William," the young man said,
"And your hair has become very white;
And yet you incessantly stand on your head-
Do you think, at your age, it is right?"

"In my youth," Father William replied to his son,
"I feared it might injure the brain;
But now that I'm perfectly sure I have none,
Why, I do it again and again."

-Lewis Carroll