Phantasmagoria ( American pronunciation , also fantasmagorie, fantasmagoria) was a form of horror theatre that used one or more magic lanterns to project frightening images such as skeletons, demons, and ghosts onto walls, smoke, or semi-transparent screens, typically using rear projection to keep the lantern out of sight. Mobile or portable projectors were used, allowing the projected image to move and change size on the screen, and multiple projecting devices allowed for quick switching of different images. The shows started under the guise of actual séances in Germany in the late 18th century, and gained popularity through most of Europe (especially England) throughout the 19th century.
From French phantasmagorie, from Ancient Greek φάντασμα (phántasma, “ghost”) + possibly either αγορά (agorá, “assembly, gathering”) + the suffix -ia or ἀγορεύω (agoreúō, “to speak publicly”).
Paul Philidor announced his show of ghost apparitions and evocation of the shadows of famous people as Phantasmagorie in the Parisian periodical Affiches, annonces et avis divers of December 16, 1792. About two weeks earlier the term had been the title of a letter by a certain "A.L.M.", published in Magazin Encyclopédique. The letter also promoted Phylidor's show. Phylidor had previously advertised his show as Phantasmorasi in Vienna in March 1790.
The English variation Phantasmagoria was introduced as the title of M. De Philipsthal's show of optical illusions and mechanical pieces of art in London in 1801. De Philipsthal and Phylidor are believed to be the same person.
Some ancient sightings of gods and spirits are thought to have been conjured up by means of (concave) mirrors, camera obscura or magic lantern projections. By the 16th century necromantic ceremonies and the conjuring of ghostly apparitions by charlatan "magicians" and "witches" seemed commonplace. In his 1613 book Opticorum Libri Sex Belgian Jesuit mathematician, physicist and architect François d'Aguilon described how some charlatans cheated people out of their money by claiming they knew necromancy and would raise the specters of the devil from hell to show them to the audience inside a dark room. The image of an assistant with a devil's mask was projected through a lens into the dark room, scaring the uneducated spectators.