Proof that the Old Masters used optical aids
The first thing you see on entering this major new Viennese exhibition is not one of Canaletto and his nephew Bernardo Bellotto’s majestic paintings of London, Venice or Vienna, but a camera obscura. The magical art of both artists depended upon this simple but effective device, which exploits pin-hole projection – an optical phenomenon that had been known since antiquity. The decision to open the show at the Kunsthistorisches Museum with a deceptively boring little wooden box amounts to a curatorial throwing down of the gauntlet. Because – although I find it hard to fathom – there are still art historians and critics out there who refuse to countenance the
