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Cardboard cyan/red glasses (photo by Flickr user xenmate)

Credit: xenmate on Flickr

Anaglyphs

From Wikipedia:

"Anaglyph images are used to provide a stereoscopic 3D effect, when viewed with glasses where the two lenses are different (usually chromatically opposite) colors, such as red and cyan. Images are made up of two color layers, superimposed, but offset with respect to each other to produce a depth effect. Usually the main subject is in the center, while the foreground and background are shifted laterally in opposite directions. The picture contains two differently filtered colored images, one for each eye. When viewed through the 'color coded' 'anaglyph glasses', they reveal an integrated stereoscopic image. The visual cortex of the brain fuses this into perception of a three dimensional scene or composition."

The Director of Applied Research at HP Labs in Singapore has a useful post on producing anaglyphs (and good background on 3D in general).

Some anaglyphs produced with the Stereogranimator:

click to see this anaglyph in detail click to see this anaglyph in detail click to see this anaglyph in detail
A basic diagram of the principle behind anaglyph images