Try this: Focus your eyes between the side-by-side images, then cross them slightly until a third, centered image comes into focus.  When your eyes find that crossed point of focus, the images being seen will appear in three dimensions in the middle image.  It is an interesting option to viewing small sculpture.  I recently learned this technique and am having fun learning to take the photographs and presenting them for viewing. A tip: if you are comfortable with the crossed eye position, and can scroll down easily, keep your eyes in the cross/focus position and the next centered 3D image will come into view without your having to refocus.

This page has four paired images, scroll down to view each of them.

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Are we having any fun yet?