The exact image I linked to is of particular interest. Here you can see something in 3D that you couldn't possibly tell just looking at the originals - that you're actually looking off a cliff edge. The landscape seen past the horizon of the cliff edge is clearly much farther off when viewing the combined image.
For anyone having trouble seeing these, the trick is to sit fairly far back from your monitor, and cross your eyes enough that you see 4 duplicate images (each of the two images doubled up). You then lessen the amount your eyes are crossed (or bring yourself nearer to the screen) until the 2 inner images of the 4 are perfectly overlapped, such that you now see 3 duplicate images. If you can then bring your eyes to focus on the middle image, it will appear in 3D.
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[ 3.3 ms ] story [ 16.2 ms ] threadHere's a copy in case the original site gets overloaded: http://imageshack.us/a/img829/3783/t6cftimgur.jpg