"In accordance with the foregoing investigations on mathematical principles, let bronze vessels be made, proportionate to the size of the theatre, and let them be so fashioned that, when touched, they may produce with one another the notes of the fourth, the fifth, and so on up the double octave."

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When the Dark comes rising six shall turn it back; Three from the circle, three from the track; Wood, bronze, iron; Water, fire, stone; Five will return and one go alone. Iron for the birthday; bronze carried long; Wood from the burning; stone out of song; Fire in the candle ring; water from the thaw; Six signs the circle and the grail gone before. Fire on the mountain shall find the harp of gold Played to wake the sleepers, oldest of old. Power from the Green Witch, lost beneath the sea. All shall find the Light at last, silver on the tree.

— Susan Cooper