Years before the invention of photoshop, Jerry Uelsmann was producing composite photographs with multiple negatives and extensive darkroom work. He uses up to a dozen enlargers at a time to produce his final images, and has a large archive of negatives that he has shot over the years. The negatives that Uelsmann uses are known to reappear within his work, acting as a focal point in one work, and background as another. His photographs can be seen in the opening credits of the television series The Outer Limits, and the illustrated edition of Stephen King’s Salem’s Lot. In addition, his artwork is featured on Dream Theater’s seventh album Train of Thought.
His darkroom technique of combining multiple negatives would ultimately lead to a revolution of mid-20th century photography and a career that spans five decades. (Source)