le Vicomte de Chagny and I were imprisoned was a regular hexagon, lined entirely with mirrors. Plenty of these rooms have been seen since, mainly at exhibitions: they are called “palaces of illusion,” or some such name. But the invention belongs entirely to Erik, who built the first room of this kind under my eyes, at the time of the rosy hours of Mazenderan. A decorative object, such as a column, for instance, was placed in one of the corners and immediately produced a hall of a thousand columns; for, thanks to the mirrors, the real room was multiplied by six hexagonal rooms, each of which, in its turn, was multiplied indefinitely. But the little sultana soon tired of this infantile illusion, whereupon Erik altered his invention into a “torture-chamber.” For the architectural motive placed in one corner, he substituted an iron tree. This tree, with its painted leaves, was absolutely true to life and was made of iron so as to resist all the attacks of the “patient” who was locked into the torture-chamber. We shall see how the scene thus obtained was twice altered instantaneously into two successive other scenes, by means of the automatic rotation of the drums or rollers in the corners. These were divided into three sections, fitting into the angles of the mirrors and each supporting a decorative scheme that came into sight as the roller revolved upon its axis.