David Hockney and others have speculatedcontroversiallythat a camera obscura could have helped the Dutch painter Vermeer achieve his photo-realistic effects in the 1600s. But no one understood exactly how such a device might actually have been used to paint masterpieces. An inventor in Texasthe subject of a new documentary by the magicians Penn & Tellermay have solved the riddle.
http://www.vanityfair.com/culture/2013/11/vermeer-secret-tool-mirrors-lenses