I'm sure most Americans will recognize it, but a plastic version of it was very well known in the Québec of the sixties, where it got a new lease on life with the production of countless pious slides that were ''given'' to meritorious students. My dad ended up with dozens of slides on stuff like ''the return of the prodigual son'', ''Jesus wrecks the temple''...
The amusing point ? First, it was marketed as giving full three dimensions vision ! You could see in 3D Job ulcers and sores ! (Yeah, not really)
The second point ? Even in the prudish Québec of the 1960, there was a pornographic black market of illegal ''pinky'' slides. People used that device to...ahem....spice up their life. The desperation of times before the Internet....
(Then again, the second movie made by Méliès, likely the second movie ever produced, was a woman in her bath. I'm surprised it was not the first one)
(The high tech 3D machine)