He was pacing. Occasionally, he stopped and stood at the lectern. It was, Jeremy noted to himself, a pentagon, a triangle on top of a square, or more accurately a pyramid on top of a cube. Together they formed the basic shape a child might use to draw a house, one side of the roof sloping back toward the speaker.
His tone was professorial, not didactic or hectoring, but smooth, unfurling precious knowledge, rolling it out in front of them, in a calm, unhurried, but authoritative voice.