close to the average distance between an Italian man’s eyes, or interocular distance,
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, of 64 millimeters.
And this,
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, it turns out,
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, is exactly how 3-D images are made. Our brains perceive depth by combining the images from each of our eyes,
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, which each see a scene from a slightly different perspective. (This is why covering one eye hampers depth perception.) So looking at two pictures that differ in perspective by the interocular difference can create a stereoscopic, or 3-D,
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, image.
One way to see the 3-D effect is to look at two stereoscopic images side by side with the field of view of each eye crossed in front of you,
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. You might remember the kids’ books that have two images that you hold right in front of your eyes and then slowly pull back while practicing a thousand-yard stare until,
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, pop! The two images merge into one 3-D picture.
To see the two Mona Lisas in 3-D, the same principle would apply. The paintings would be viewed side-by-side with the viewer’s eyes converged in front of them (or with the eyes looking farther apart, a similar technique called parallel viewing).
The two images can also be tinted red and cyan and then viewed through old-school red-and-blue 3-D glasses to get the same effect. The researchers tinted electronic versions of the two paintings,
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, and voila. Dig out some 3-D glasses for this one (plus see more

http://forum.drimmi.ru...3&p=601392#post601392

http://users.atw.hu/sj...rum_topic&topic=30866

http://www.azull.info/...mp;view=article&id=62