The idea that there might be other worlds has existed for centuries, and it lies inside ghost and fairy stories as well as more complex, science-based ideas, like those in quantum physics. Could there be a whole series of universes called a multiverse? This text defines reality, perception, probability, consciousness, and many other complex concepts in easy-to-understand language that's complimented by vivid full-color artwork. Even the most observant reader won't notice they're learning science and history as they dive into dreams, the subconscious, hyperspace, Flatland, the Big Bang theory, Schrödinger's cat, virtual reality, and other fascinating topics related to the study of reality.