Not long ago we were quite confident about how to go about thinking. If we wanted to think about some fundamental value—say, justice—we charted the course of our exploration over the broad and silent ocean of historical and philosophical knowledge accumulated in libraries. Within the last few decades, however, we have discovered, to our dismay, that knowledge has burst the boundaries of print to attack not only eyes, but ears, touch—the whole sensorium. Ease of travel and the wonders of electronics have launched us into an informational universe of too many dimensions. We can be almost anywhere. We can watch space lift-offs and half-an-hour later watch magnified human sperm travel into the womb and beyond. We can "see" the color-coded temperature of Jupiter and look back from beyond the Earth. We can see and hear war happen.