claims for having directed the scene, notes that these storyboards did introduce key aspects of the final scene—most notably, the fact that the killer appears as a silhouette, and details such as the close-ups of the slashing knife, Leigh's desperate outstretched arm, the shower curtain being torn off its hooks, and the transition from the drain to Marion Crane's dead eye. Krohn notes that this final transition is highly reminiscent of the iris titles that Bass created for Vertigo. Krohn also notes that Hitchcock shot the scene with two cameras: one a BNC Mitchell, the other a handheld French Éclair camera which Orson Welles had used in Touch of Evil (1958). In order to create an ideal montage for the greatest emotional impact on the audience, Hitchcock shot a lot of footage of this scene which he trimmed down in the editing room. He even brought a Moviola on the set to gauge the footage required. The final sequence, which his editor George Tomasini worked on with Hitchcock's advice, however did not go far beyond the basic structural elements set up by Bass's storyboards. According to Donald Spoto in The Dark Side of Genius and to Stephen Rebello in Alfred Hitchcock and the Making of Psycho, Hitchcock's wife and trusted collaborator, Alma Reville, spotted a blooper in one of the last edits of Psycho before its official release: after Marion was supposedly dead, one could see her blink. According to Patricia Hitchcock, talking in Laurent Bouzereau's "making of" documentary, Alma spotted that Leigh's character appeared to take a breath. In either case, the postmortem activity was edited out and was never seen by audiences. Although Marion's eyes should be dilated after her death, the contact lenses necessary for this effect would have required six weeks of acclimation to wear them, so Hitchcock decided to forgo them. It is often claimed that, despite its graphic nature, the shower scene never once shows a knife puncturing flesh. However, a frame by frame analysis of the sequence shows one shot in which the knife appears to penetrate Leigh's abdomen, but the effect was created by lighting and reverse motion. Leigh herself was so affected by this scene when she saw it, that she no longer took showers unless she absolutely had to; she would lock all the doors and windows and would leave the bathroom and shower door open. She never realized until