Hockney–Falco thesis
The Hockney–Falco thesis is a controversial theory of art history that argues that advances in naturalism and accuracy in Western art since the early Renaissance were due primarily to optical aids such as the camera obscura, camera lucida, and curved mirrors, and that the use of these aids was more widespread than previously believed. The theory was proposed by artist David Hockney in 1999 and further advanced with physicist Charles M. Falco since 2000 (together as well as individually).