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Today's viewers tend to remember Alfred Hitchcock as the Master of Suspense. He's still known for Psycho and particularly its famous shower scene; then one of the most violent sequences in the history of cinema (even though it involved a fair bit of chocolate syrup). But Hitchcock did much more than Norman Bates and tightly constructed murder mysteries.

Through the 1920s and 30s, he began to experiment with different approaches to familiar subjects: putting the missing person story on a train in the Lady Vanishes or playing around with theatricality in a spy film, with the 39 Steps.

By the time he came to America in the 1940s, Hitchcock was already larger than life, working with the legendary producer David O Selznick, also famous for Gone with the Wind. While their collaborations weren't the most comfortable, they did come up with superlative films, including Hitchcock's examination of psychoanalysis, Spellbound, from 1945.

Right in the middle of that film is one of the particularly special moments of Hitchcock's filmmaking history: A dream sequence that was designed in collaboration with surrealist artist Salvador Dali. The original version was said to be too long and too surreal to actually make it into the final cut, and little remains of it today other than production stills.

But the final result is still typically Dali: melted objects and eyes being cut and running through massive surreal landscapes. It's also characteristically Hitchcock, with the dream sequence actually working as a key clue in a murder mystery. But even if you have no idea what's happening in the film, the sequence is still a treat to watch.