MrMelodramatic posted...
so you put a wheel of film and you can see pictures you took without having to get them developed?
No, it's more so they can sell you discs that are effectively a slide-show projector presentation with the projector, and that only one person can look at at a time.
They were hugely popular, and often used images from TV shows and movies that were big at the time, or had sweeping vistas (like, say, the Grand Canyon) so you could sort of get a primitive virtual reality view of what it would look like to go there without having to go there.
One also shows up as a major plot point in Mad Max: Beyond Thunderdome:
http://www.youtube.com/watch?v=23SVHUPrUJ4&t=2m20s
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