For centuries, the notion of parallel universes, hidden realities ruled by distinct laws of Nature, has fascinated philosophers and scientists alike. Now, a new theory of physics, the QCI hypothesis, predicts that alternate dimensions of the cosmos truly exist, together comprising an endless quilt of parallel realities. A straightforward generalization of quantum physics, the science of subatomic particles, QCI Theory holds the promise of forever changing our understanding of the cosmos. In this volume, for the first time, the original discoverer of the QCI hypothesis has provided a simple explanation of the theory, suitable for anyone with an interest in the nature of the universe. Discover the colossal potential extent of the multiverse, the bizarre laws of physics applying in hidden dimensions, and the possibility of experimental confirmation. The gates are truly open for our understanding of reality.