Hugo looked up and down the street. There was no one in sight. The evening was still duskily lighted by afterglow. "Look out then. I'm gonna jump."
Mr. Danner saw his son crouch. But he jumped so quickly that he vanished. Four seconds elapsed. He landed where he had stood. "See, dad?"
"Do it again."
On the second trial the professor's eyes followed the soaring form. And he realized the magnitude of the thing he had wrought.
"Did you see me?"
Danner nodded. "I saw you, son."
"Kind of funny, isn't it?"
"Let's talk some more." There was a pause. "Do you realize, son, that no one else on earth can do what you just did?"
"Yeah. I guess not."
Danner hesitated. "It's a glorious thing. And dangerous."