Radex Stereo Stories (also known as Story Time in 3-D) consisted of a set of colour stereoscopic slide pairs that could be viewed in an inexpensive plastic viewer, and were introduced by the Radex Stereo Company of California in the early 1950s.
Radex already made an up-market metal-bodied stereoscopic viewer called the Binocular Scope, and this used a special adaptor for two separate 35mm stereo slides for which Radex produced a catalogue of slide titles.
The Radex Stereo Stories viewer was very much simpler, and the stereo images were contained in a single cardboard mount. The system was aimed at children, and the stories consisted of six pairs of images of dioramas, with a description written on the mount. Some sets were on white card, while others were on brown card with cut-outs at the top, the purpose of which is unclear.