There may actually be a second Mona Lisa by Leonardo Da Vinci in 3D. German visual scientists have found a Mona Lisa painting in the Museo del Prado in Madrid that may have been painted either by Da Vinci or by one of his students. The original Mona Lisa is at Louvre in Paris. The researchers from University of Mainz looked at so-called trajectories or paths from a distinctive point on the source such as the tip of Mona Lisa’s nose. It turned out the real Mona Lisa and the Prado one were painted from slightly different perspectives and the two form a stereoscopic pair. When viewed together, these create an impression of depth, a 3D image. This evidence “might indicate that Da Vinci did not only think about the 3D issue theoretically but in a very practical sense in terms of experiments,” the researchers told the media.