Leonardo da Vinci was, to put it mildly, a smart guy. He was an inventor and scientist as well as an artist, and he took a special interest in finding ways to realistically render three-dimensional forms on a flat canvas. And now, a pair of researchers say that in the early 1500s he might have created the world’s first 3-D image.
Even more surprising: It’s the Mona Lisa.
Or to be...