Mirror-based
stereoviewer
by Luca Cassioli 2005
Click image to view large printable version of schematic.
How it looks like, compared to my hand, a red-blue glass and my monitor:
My page about more complex version of the stereoviewer (in Italian):
http://www.geocities.com/SiliconValley/Lakes/2402/stereovisore/costruz.html