This is one of the oldest and best known 3D technologies that are still commonly used nowadays.  For 3D visualisation, you need to wear a pair of glasses with red filter on the left-hand side and blue (or cyan for better quality but some images may require the green one) filter on the right-hand side (like the icon shown on the upper left corner of this paper).  While the old anaglyph images usually distort the original colors of the objects, the present technology could preserve the full color to some extent.  Most often, prolonged visualisation through the filter glasses could cause some unpleasant feeling to many people.

Useful resources and hyperlinks:

• Analgyph stereo, step-by-step -
• http://collection.nlc-bnc.ca/100/201/300/palaeontologia/03-12-19/2003_2/rubber/steps.html

• Anaglyph links - http://www.dddesign.com/3dbydan/3dlinks/linksct.htm

• 3D for Science Education freeware - http://vr.ied.edu.hk/~has/research/package/3DSE.exe