Tengo made a point of asking people how old they were at the time of their first memory. For most people it was four or five. Three at the very earliest. A child had to be at least three to begin observing a surrounding scene with a degree of rationality. In the stage before that, everything registered as incomprehensible chaos. The world was a mushy bowl of loose gruel, lacking framework or handholds. It flowed past our open windows without forming memories in the brain.

Surely a one-and-a-half-year-old infant was unable to grasp what it meant for a man who was not his father to be sucking his mother’s breasts. That much was clear. So if this memory of Tengo’s was genuine, the scene must have been seared into his retinas as a pure image free of judgment-the way a camera records objects on film, mechanically, as a blend of light and shadow. And as his consciousness matured, the fixed image held in reserve would have been analyzed bit by bit, and meaning applied to it. But is such a thing even possible? Was the infant brain capable of preserving images like that?

Or was this simply a false memory of Tengo’s? Was it just something that his mind had later decided-for whatever purpose or plan-to make up on its own? Tengo had given plenty of thought to the possibility that this memory might be a fabrication, but he had arrived at the conclusion that it probably was not. It was too vivid and too deeply compelling to be fake. The light, the smells, the beating of his heart: these felt overwhelmingly real, not like imitations. And besides, it explained many things-both logically and emotionally-to assume that the scene was real.

This vivid ten-second image would come to him without warning and without consideration of either time or place. He could be riding on the subway or writing formulas on the blackboard or having a meal or (as now) sitting and talking to someone across a table, and it would envelop him like a soundless tsunami.