“We will go to Asgard . . . now,” he said. At that moment he raised his hand as if to pluck an apple, but instead of plucking he made a tiny, sharp turning movement. The effect was as if he had twisted the entire world through a billionth part of a billionth part of a degree. Everything shifted, was for a moment minutely out of focus, and then snapped back again as a suddenly different world. This world was a much darker one and colder still.

