I made the viewer out of two types of black poster board: thin (regular) poster board and the padded (reinforced) poster board. I also used paperclips, duct tape, and a marker (as the handle).
Figure 1: Stereoscopic Slide Viewer
For the slides, I made a set of slides of Sunset Lawn Cemetery in Harrisburg, IL. I thought it was a nice ambiance and recreated many artifacts made during the height of spiritualism. Many trick photography, magic lantern, and stereoscopic slides sets dealt with the mystical or dreadful.
Figure 2: Slides