It's a prerequisite that a movie about dreams offers the audience truly otherworldly images and locations. Whether we're talking about horror movies like "The Nightmare on Elm Street," inventive anime like "Paprika," or a crime thriller like "Inception," any movie about dreams has to include some show-stopping dream sequences to be considered a success, and "Slumberland" certainly delivers on that front.
In Nemo's first nightmare, she witnesses the death of her father at the tentacles of a giant squid made of dark smoke. In her first dream, she sees people made of butterflies. These sequences are all beautiful or exciting, and often both. Some are just downright fun to watch.
The best, of course, combine the beauty and the excitement, like the blue city of glass that can continually create new roads for the dreamer's truck to speed through, or the Canadian's goose-flying dream that offers a thrilling aerial trip amongst breathtaking mountains. "Slumberland" is first and foremost a story about impossible adventure, and it nails the visuals on these different dreamscapes.