First Kircher explained how steel mirrors were made and polished--mirrors or reflectors are still of importance in gathering light in the motion picture projector. He commented on the various types of convex, concave, spherical and other types of mirrors. In Kircher’s day even the learned were quite uneducated according to modern standards, especially on all matters of physical science. Images that appeared from nowhere were most mysterious and few knew how they were produced. The telescope and microscope were still very new and many doubted what their eyes saw through these inventions. Kircher, as a showman, described a Catoptric Theatre--a large cabinet in which many mirrors were concealed. One of the “Theatres” was placed in the Villa Borghese Palace in Rome and doubtless delighted the nobles of that day as much as the people in the United States were pleased with the first Edison peep-show machines in 1894. For Kircher’s Catoptric Theatre was an early peep-show device. It also has a relation to the Kaleidoscope of the early 19th century. The first form of the magic lantern described by Kircher was merely a lantern suitable for showing letters at a remote distance. It is very simple and appears entirely elementary. But the first step was taken. The third problem of the third section of the tenth book of the _Ars Magna Lucis et Umbrae_ was how to construct such an artificial lantern with which written characters may be shown at a remote distance. The parts are easily distinguished--a concave mirror at the rear; a candle for a light source; a handle and a place for inserting silhouette letter slides. Kircher noted that in the device the flame will burn with an unaccustomed brilliance. “Through the aid of this device very small letters may be exhibited without any trouble.” He noted that some will think there is an enormous fire, so bright will the lantern shine. He added that the strength of the light will be increased if the interior of the cylinder is covered with an alloy of silver and lead to increase its reflecting qualities. The second Kircher device of direct relation to the motion picture is his machine for creating metamorphoses or rapid changes. All kinds of transformations could be shown. Here was first introduced the revolving wheel on which pictures were painted. It bears an analogous relation to the motion picture devices of the early 19th century--also using a revolving vertical wheel. The modern projector likewise has its film pictures on a small wheel or reel. Kircher explained that in this catoptric machine a man looking at the mirror (equivalent to the screen in a theatre) sees images of a fire, a cow and other animals all blending one into another. It is unlikely that the giant wheel could be revolved swiftly enough to give anything like the proper illusion of motion but certainly there was a transformation which must have appeared wondrous and entertaining. (Illustration facing page 48.)