Use your 3-D glasses to view the Mona Lisa

Well, it hasn’t come to that yet, but some day it may. Or visit museums in Paris and Madrid and Instragam photos of the world’s most famous painting.
After all novels have been written in this Millenium telling stories about the Italian painter, scientist and genius who lived 500 years ago.
The latest theory is that Leonardo da Vinci, like many artists before him and after him, was not content with what conventional labors produced. Even the mystic smile of “Mona Lisa,” or “La Giocanda,” filled with riddles was not enough for him.
“And, now a pair of reseachers say that in the early 1500s he might have created the world’s first 3-D image,” Science News reports.
To do it, without film or stereoscopic photography having been invented yet, da Vinci did it by making two paintings of his signature painting. Placed next to each other some see a kind stereoscopic effect.
“This points to the possibility that the two [paintings] together might represent the first stereoscopic image in world history,” researchers Claus-Christian Carbon and Vera Hesslinger of the University of Bamberg wrote in their debut report last year in Perception.
The scientists became interested in 2012 when “a seemingly insignificant ‘knof-off' the Mona Lisa in the Museo del Prado in Madrid was in actuality very close to the original hanging in the Louvre…,” Live Science reported.
"When I first perceived the two paintings side by side, it was very obvious for me that there is a very small but evident difference in perspectives," study researcher Claus-Christian Carbon of the University of Bamberg in Germany wrote in an email to Live Science.
Mark Arguin of the University of Montreal said the claim is "is accurate in its analysis of the images and interpretation of a possible intent at a stereoscopic representation of the hands area.”
It appears to achieve the effect that da Vinci, and likely one of his students, did the paintings from different angles. Charon says Da Vinci spent many hours working on trying to create the effect.
But to see it the two paintings have to be placed side by side.
"Still, despite all these indications, we have not found final proof for our hypothesis," he said.
In the history of art, as in anything else, achievements come in fits and starts. Vermeer, for example, if he used the “camera obscura,” was certaintly not the first. And later armies sought to use it in war.