Revolutionary string theory claims that we live in a ten-dimensional universe, but only four of these dimensions are accessible to human perception. According to modern scientists, the remaining six dimensions are folded into an amazing structure known as the Calabi-Yau manifold. Legendary mathematician Shintan Yau, one of the discoverers of these amazing spaces, argues that geometry is not only the basis of string theory, but also lies in the very nature of our Universe. Reading this book, you, along with the authors, will retrace the exciting path of scientific discovery: from a crazy idea to completed theory. A fascinating exploration awaits you, an amazing journey into the hidden dimensions that define what we call the Universe, both on a large and small scale.