Michi Kaku's Hyperspace explores the notion that there are a number of dimensions beyond the four commonly accepted ones of space and time. This is the invisible universe, the world of geometry and space-time, also known as supergravity.

Hyperspace theory studies the convergence of natural laws across varying disciplines. The book is divided into four parts: the history of hyperspace, the theory, extensions of the theory, and suppositions about how to harness the power of hyperspace.

Part I includes a review of laws of nature and how these become simpler and more elegant when expressed in higher dimensions. Kaku likens this phenomenon to how different the surface of the earth looks from the perspective of a person standing on its surface compared to the person's viewing the earth's surface from outer space.

Part II the discusses the possibility of unifying all known laws of nature into a single theory.

Part III extends the theory, developing the notion of the bubble universe, positing that our definitions of space and time are meaningless outside the bubble we occupy.

Part IV explores how we might harness the power of hyperspace theory. If everything we see are vibrations in hyperspace, as suggested by the theory, the job before us, if the theory remains robust, is how to harness the theory's power.

Kaku encourages those attempting to solve scientific puzzles to look at the bigger picture. In our effort to name things, we have divided up the universe into smaller and smaller parts, which tends to destroy context. Many scientists, Kaku says, have expressed concern about the popularization of the right brain-left brain dichotomy. As a result of this popularization, people often tend to attribute sequential thinking to the right brain and holistic thinking to the left. The human brain, he says, necessarily uses both halves, and the dialectic between the two halves is more important than the individual function of each half. In fact, he says, a look at the higher order integraiton of both halves of the huma brain solves a lot of contradictions.

Koku tells us that to escape the myopia, we must look to the cutting edge theories in many different disciplines. The search for the single overarching theory to explain how our world works depends, according to Kaku, on the view of the forest, not the trees.

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