from the early 15th century many Western artists used optics--by which I mean mirrors and lenses (or a combination of the two)--to create living projections
His basic idea is that tools like the Camera Obscura and the emerging science of optics created technological methods that allowed artists to create effects like realistic perspective.
But his views have offended some in the mainstream art world. As an Amazon review of the book reports:
Hockney concedes that his opinions have been attacked by the mainstream art world that has complained that "for an artist to use optical aids would be 'cheating'; that somehow I was attacking the idea of innate genius".
Is Hockney's thesis convincing? Did some of the great artists use technological aids to create their masterpieces?