They would howl with glee, and Sax’s forehead would knot up as he realized that they had done it to him again. He would sigh, and go back to where he had been when the game began. But every time they started it again, he never seemed to remember, as long as the initial why was plausible enough. And even when he did recognize what was happening, he seemed helpless to stop it. His only defense was to say, with a little frown, “Why what?” That slowed the game for a while; but then Nirgal and Jackie got clever at guessing what in any statement most deserved a why, and as long as they could do that, Sax seemed to feel it was his job to continue answering, right on up the chains of because to the Big Bang, or, every once in a while, to a muttered “We don’t know.”

“We don’t know!” the class would exclaim in mock dismay. “Why not?”

“It’s not explained,” he would say, frowning. “Not yet.”

And so the good mornings with Sax would pass; and both he and the kids seemed to agree that these were better than the bad mornings, when he would drone on uninterrupted, and protest “This is really a very important matter” as he turned from the blackboard and saw a crop of heads laid out snoring on the desktops.

• • •

One morning, thinking about Sax’s frown, Nirgal stayed behind in the school until he and Sax were the only ones left, and then he said, “Why don’t you like it when you can’t say why?”

The frown returned. After a long silence Sax said slowly, “I try to understand. I pay attention to things, you see, very closely. As closely as I can. Concentrating on the specificity of every moment. And I want to understand why it happens the way it does. I’m curious. And I think that everything happens for a reason. Everything. So, we should be able to tease these reasons out. When we can’t . . . well. I don’t like it. It vexes me. Sometimes I call it”— he glanced at Nirgal shyly, and Nirgal saw that he had never told this to anyone before—”I call it the Great Unexplainable.”

It was the white world, Nirgal saw suddenly. The white world inside the green, the opposite of Hiroko’s green world inside the white. And they had opposite feelings about them. Looking from the green side, when Hiroko confronted something mysterious, she loved it and it made her happy— it was viriditas, a holy power. Looking from the white side, when Sax confronted something mysterious, it was the Great Unexplainable, dangerous and awful. He was interested in the true, while Hiroko was interested in the real. Or perhaps it was the other way around— those words were tricky. Better to say she loved the green world, he the white.