One of the biggest surprises about modern technology is not how productive it makes us, or how it has revolutionized the workplace, but how enjoyable it is. The great success of new technologies—such as social networking, computer graphics, wireless networks—are in how they create pleasure in our lives. People taking a walk in a forest can use a GPS device to track where they are, or while watching a football match use a phone to record a video clip of the game. Entire categories of leisure activities (such as sport and television) depend upon technology for their very existence.