Question: For what ride is Pepper's ghost, an illusion technique, used when the Blue Fairy disappears, leaving a pile of fiber-optic fairy dust on the floor?
Sentence (from "Tim Erem"): He is best known for directing and writing music videos for artists such as Rihanna, Drake, Tove Lo, Elliphant, Katy Perry, MØ and Major Lazer.
Relevant evidence: No