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Scientists who have studied the painting “Mona Lisa” by Leonardo da Vinci, suggested that it might be the earliest 3D model art. In 2012, experts found that a copy of the Mona Lisa, which is located in the Madrid Museum, is actually very close to the original, which is located in the Louvre. Most likely, I wrote a copy Leonardo da Vinci himself, or perhaps one of his students. Researcher from the University of Bamberg, Klaus – Christian, told that when he first placed both paintings side by side, it became visible a very small but obvious difference in perspectives. “May be, such tiny differences, I as a psychologist perceive more sensitive, but upon careful examination of the paintings, this difference visible to almost everyone. “It turns out that the real” Mona Lisa “and her a copy was drawn from several different points. Specialists have studied this perspective shift with trajectories. Whereby it turned out that the artist wrote a copy of “Mona Lisa” under the more left angle than the original was written. They also found the horizontal difference between the two paintings is 69 millimeters, which close to the average distance between two human eyes. When a person looks at an object, each of his eyes sees a slightly different perspective. These two visions of our eyes go to the brain and turn into three-dimensional perception. Based on these studies experts believe that both paintings form stereo pairs, that is, if you look at the pictures at the same time – you get a feeling of depth 3D images. Maybe these pictures are painted with a touch of light. deviation is not accidental? Perhaps Leonardo da Vinci or perhaps one of his students intentionally created this stereoscopic pair? Unfortunately, researchers cannot unambiguously answer this question. However, there is information that da Vinci for a long time worked intensively on 3D images and even invented the first stereo glasses. In addition, there were hints in the museum’s inventory lists on the existence of two Giocond. 
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This means that da Vinci did not approach the issue of 3D images only theoretically, but also experimented in practice. At looking at the original colors of these two paintings becomes noticeable that the only real difference is only on the sleeves of the Mona Lisa. On the in one picture, the sleeves have a reddish hue, and in the second – greenish. Some experts suggest that this color the difference is a hint of Leonardo that his paintings need look through red-green glasses. Others believe that all of these facts are not evidence of intent creating da Vinci stereoscopic effect for his Giocond. For example, the differences between the two pictures in other areas of the body, as not in hands, not suitable for creating a stereoscopic pair. Besides Moreover, the fact that the differences in largely oriented vertically rather than horizontally, how it should be supposed to be. Ideally horizontal imbalances should create a proper 3D impression that in mainly found in the area of the hands of the Mona Lisa. It is this part of both paintings can be called the most wonderful and intriguing area of three-dimensional effect, especially when you consider that the Mona Lisa were created at the beginning of the 16th century.
