Wait! That’s Not All!
Rhett’s got a post up on parallax, and how you can use this effect to measure distance: Parallax, what is it good for? He’s got some pictures showing the effect of viewing from different vantage points.
The other thing you can do with such photos is to make stereograms, and I’ve taken the liberty of doing so with Rhett’s image, though I didn’t try and take out the dotted lines.
Cross your eyes and you can make the image take on depth. In case you want more, here’s the optics layout stereogram I posted a while back.
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I was never good with these stereogram things. Did you get it to work with your eyes? Great idea.
Put your finger about three or four inches from your nose and lined up with the bottom of the image, and the screen about a foot away. Stare at your finger, and the image should be close to working.
Conversely, when the image is 3-D, you should only see one image of your finger.
Stereogram generators like ORTEP, HyperChem, etc. configure wall-eyed not cross-eyed,
http://www.mazepath.com/uncleal/benzil.png
Cross-eyed is brutal for larger graphics. Stereogram headaches are memorable. The image will go 3-D in either case, but not using the generating assumption will turn it inside out. An interesting exercise is to have stereograms of enantiomers then split and realign the pairs. The superposed image pair then gives a perfectly flat construct. It looks so wrong…