Leonardo da Vinci may have secretly created a Mona Lisa in 3D, researchers investigate Leonardo's famous portrait, the Mona Lisa, has another almost exact copy painted from a slightly different perspective. The two portraits may have been an early attempt at creating a 3-D image, researchers say. by Jim Algar
Science Beyond that Mona Lisa smile: Did Leonardo da Vinci create the first 3D image? by Alexander Saltarin