Silicon Valley, and everything it stands for metonymically in our culture, has indeed affected billions of people around the planet. The innovations have come fast and furious, turning the past four decades into a series of “before and after” divides: before and after personal computers, before and after Google, before and after Facebook, iPhones, Twitter, and so forth. In the silicon age, “changing the world” means at bottom finding new and more ingenious ways to turn my computer or smart phone into my primary—and eventually my only—access to “reality.”