A constantly changing medley of real or imagined images (as in a dream) WordNet 3.0 & Open English WordNet

Phantasmagoria, alternatively fantasmagorie and/or 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. Wikipedia

Form of horror theater using an optical device to display moving images. Wikipedia Disambiguation

Form of theatre that includes the use of magic lantarns Wikidata

A dreamlike state where real and imagined elements are blurred together. Wiktionary

A dreamlike state. Wiktionary (translation)