Phantasmagoria is a theatrical form that combines visual effects, storytelling, and music to create a dreamlike experience. Originating in the late 18th century, it often featured ghostly images projected onto screens or walls, captivating audiences with its eerie and fantastical themes. The term also refers to a series of rapidly changing images or illusions, evoking a sense of wonder and confusion. Phantasmagoria has influenced various art forms, including literature and film, and remains a popular concept in horror and fantasy genres, showcasing the interplay between reality and imagination.