In part this book takes the form of a conversation between Hockney and Gayford. Together they explore how, and why, pictures have been made across the millennia. Juxtaposing a rich variety of images - from a Japanese woodblock print to a still from a Disney film - the authors cross the normal boundaries between high culture and popular entertainment and make unexpected connections across time and media. "The history of pictures begins in the caves and ends, at the moment, with the computer screen. Who knows where it will go next? But one thing is certain, the challenge remains the same: how do you represent the three-dimensional world on a two-dimensional surface?" David Hockney