A Mona Lisa as puzzling as the smile of Leonardo da Vinci's muse - made out of nearly 300 Rubik's Cubes - sold for nearly half a million euros. The unique item was up for auction in Paris on Sunday evening. Created by the French street artist Franck Slama, famous for the pixellated Space Invader mosaics that have popped up on city streets around the world, the 'Rubik Mona Lisa' ...