World Behind the Door: An Encounter with Salvador Dali by Mike Resnick

From the back of the book:
Salvador Dali's The Persistence of Memory is one of the most memorable images in the world. Now this surrealist masterpiece is at the centre of a tale about the connection between Dali's celebrated painting and quantum physics, through the story of a young girl named Jinx and her effect on Dali when he was seeking a new direction for his art. In the 1920s, Dali, deeply troubled that his art had become uninspired, comes across a door in the back of his closet, through which he finds a fantastical parallel universe. And it is in this world that Dali meets Jinx, who serves as his muse for much of the rest of his life. For it is through their conversations as well ass his visits to her world that Dali begins to "see" and paint the surreal images that can only be described as Daliesque.