Secret Knowledge created an international sensation when it was first published. David Hockney's theory of how the great works of Western art were created with mirrors and lenses attracted major media attention around the world and generated intense debate in the fields of science and art history. Now, in this expanded edition, Hockney takes his thesis even further, revealing for the first time new findings.<BR>In Secret Knowledge, Hockney explains how he uncovered piece after piece of scientific and visual evidence, each one yielding further revelations about the past. With the benefit of his painter's eye, he examines the major works of art history and reveals the truth of how artists such as Caravaggio, Velazquez, van Eyck, Holbein, da Vinci, and Ingres used mirrors and lenses to help them create their famous masterpieces. For this new edition, Hockney delves still deeper into art history, disclosing the evidence that Renaissance artists also used these methods to develop perspective and chiaroscuro - radically challenging our view of how these two foundations of Western art were established.<BR>Hundreds of paintings and drawings are reproduced and accompanied by Hockney's descriptions. His own photographs and drawings illustrate the various methods used by past artists to capture accurate likenesses and present the results they would have achieved. In addition, extracts from the many historical and modern documents he uncovered offer further intriguing evidence, while correspondence between him and an array of international experts provides an account of the remarkable story as it happened.<BR>Secret Knowledge is not just about the lost techniques of the Old Masters. It is also about now and the future. It is about how we see, treat, and make images today, in an age of computer manipulation.