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Now your talking about Stereo Acurity. Most people have the ability to look at an overlapping set of photographs and make out a three dimensional image. The level to which you can see more stereo than another person is based on you individual acurity. I know about this stuff because when I was in the Army ('81-87) I was a cartographer (map maker) and I worked primarily in photogrammetry ( which involves 3d images of the earth) doing what is called plotting (this job also involved doing a lot of surveying too and I loved that too). You need to be able to see 3d really well so that you can plot contours on maps. Anyway only about half the population has the acurity to plot contours and only 10% of that 50 can do it at a high level. Luckily I was in that 10% because I hated drafting.
So those 3d images are really a snap for me.
regards.
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