Creatures of Dr. Dee is a game of imagined correspondence: the Fellow takes up the position of a contemporary of John Dee — Elizabethan court astrologer, geometer, librarian, and conversant with angels — and engages, by letter and by record, with one of the entities Dee himself reported in the seven hundred extant pages of his spirit diaries. The game does not ask the Fellow to believe in angels. It asks them to take the seventeenth-century practice of angelic correspondence seriously as a literary and contemplative form, and to discover what it is like to write into that form as Dee did. The discipline belongs to the Heart-Openers because its central exercise is moral imagination: a sustained, attentive, written conversation with a being one has half-invented and half-inherited.