Science fiction is as much a literature of the moment as it is of the future. This book, then, is both a warning and an encouragement: a novel that engages with the world we're building and tries to show us a way to become a mature civilisation rather than a raggle-taggle band of individuals. Technology has libertarian roots, but in the end we build the tools that construct a civil society. In Existence Brin shows us the world our technology is building, and then poses one of the biggest questions: what is it all for?
What we're left with in Existence is one of those rare SF novels that needs to be on every technologist's desk, alongside John Brunner's Shockwave Rider, Vernor Vinge's Rainbows End, Charles Stross's Rule 34, and Brin's own Earth. We may not be able to see our future, but in Existence we get a picture of a possible — even a plausible — tomorrow.