Leveling the Playing Field explores the technologies that “trickle down” to the rest of us, those that were once the domain of the wealthy and powerful—and which therefore tended to make them even more wealthy and powerful. Now, though, these technologies—from books to computers to 3D printing and beyond—have become part of a common toolkit, one accessible to almost anyone, or at least to many more than had heretofore had access. This is what happens with most technologies: They begin in the hands of the few, and they end up in the hands of the many. Along the way, they sometimes transform the world.