For a long time he frowned at the brick path that lay between himself and the bird, and then he let go of the wall. He took one step and then more, buoyed up by some impossible antigravity. After two steps the hummingbird was gone, but Nicholas still headed for the air it had occupied, his hands grasping at vapour. It was as if an invisible balloon floated above him, tied to his overall strap, dragging him along from above. He swayed and swaggered, stabbing one toe at a time down at the ground, pivoting on the ball of one foot, and then suddenly the string was cut and down he bumped on his well-padded bottom. He looked at me and screamed. 'You're walking,' I told Nicholas. 'I promise you it gets easier. The rest of life doesn't, but this really does.' I stayed out there with my book for the rest of the afternoon, surreptitiously watching as he tried it over and over. He was completely undeterred by failure. The motivation packed in that small body was a miracle to see. I wished I could bottle that passion for accomplishment and squeeze out some of the elixir, one drop at a time, on my high-school students. They would move mountains.