21. "Sight-seeing " opens with an early version of virtual reality : a stereoscope . 22. He called it the " lenticular stereoscope ", which was the first portable, 3D viewing device. 23. The megalethoscope was and is often confused with the stereoscope which was of a different design and effect. 24. Lkyo soon mastered the techniques of drawing stereoscope images ( " ", eyeglass pictures ). 25. A stereoscope image of the Pioneer Cabin with people and horse passing through ( c . 1867 1899) 26. The stereoscope craze was long-lived : It waxed and waned for the better part of a century. 27. This beguiles a little; we get a third-dimension, stereoscope effect as reality and fiction play tag. 28. When this pair was viewed through the stereoscope , however, the square appeared to rise out from the page. 29. In the 1970s, Christopher Tyler invented autostereograms, random-dot stereograms that can be viewed without a stereoscope . 30. Seen through the stereoscope , the images merged into one, creating a 3-D effect that astounded and amazed.
