Double take

摘要

Those who visit the Louvre, in Paris, hoping to get a good picture of Leonardo da Vinci's masterpiece, "Mona Lisa", are destined for disappointment. Their photos will almost certainly be ruined by reflections from the bulletproof glass that protects the work from vandals. Indeed, any snap taken through glass risks bearing a ghostly image of the scene behind the photographer, or of the photographer himself. A polarising filter or a lens shield can ameliorate the problem, but YiChang Shih of the Massachusetts Institute of Technology (MIT) and his colleagues think they have found a way to abolish it altogether.