Spectru. Visual Trickery.
The ViewMaster is an intimate and intricate device relying on confusing the eye.
Adding a layer of optical technology gives these shadowy sequences an extralayer of unreality. Reality, however, comprises things outside the spectrum of human vision.
Vintage Bakelite ViewMasters.
directions - lift a ViewMaster to your eye level and press the button
until it clicks to revolve the reel.