...nineteenth-century discussions of church mazes are dotted with references to one M. Bonnin, who had collected more than two hundred maze designs that he intended to publish as soon as he had completed the accompanying text. So far as I can tell, nothing ever appeared in print, and the cautionary figure of M. Bonnin stalks my nightmares.
— The Idea of the Labyrinth from the Classical Period through the Middle Ages, Penelope Reed Doob