The document discusses the concept of the doppelganger in the film Vertigo and how it relates to the main character Scottie. It explains that Madeleine and Judy represent doppelgangers of the same character, reflecting the vices and virtues within Scottie's personality. Scottie attempts to recreate his experiences with Madeleine by turning Judy into her double in order to cure his psychological trauma of vertigo. The document also discusses how Hitchcock uses repetition of locations and techniques to reinforce the doppelganger concept and allow Scottie to relive and attempt to repair his trauma.