After a moment, the fingers touch the keys again, and Break pantomimes surprise. "The Canon per tonos, for example, returns upon itself a full tone higher than it begins, inviting the player—that’s me—to continue the piece upwards, ever upwards, to another realm of expression, to the Celestial City, to the far reaches of ultrasound and the image of the human body’s interiority, to music which could only be played in solar plasma." He snatches his fingers from the keyboard as if burned, blows on them. Laughter. He resumes, more sedately. "It’s cyclical, forever trending upwards, like the alchemical symbol for fire. It is therefore sometimes known as the ‘Eternal’ or ‘Heavenly Canon.’ "