Three Dimensional Virtual Reality. It sounds very modern, but we have been having it in Warsaw since 1905! It is called FOTOPLASTICON and is still working in the same way as over hundred years ago.
Address: Al. Jerozolimskie 51 see on google maps Open daily except for Tuesdays 10-18, admission 1PLN (appr. 0,25 EUR), free on Sundays.
Now you can walk through the streets of many cities by using Google Maps street view option. Hundred years ago people had the same need of virtual traveling and fotoplasticons were very popular across the world.
Fotoplasticon gives possibility of viewing photographs, made with technology called stereoscopy. Each eye has it's own point of view (close left one, then right one - you'll see that the view is a bit different- in your brain these two pictures are mixed into 3D view).
So for viewing 3D photographs a "double" picture (see the photo above) is needed. It's made with special camera having two lenses. As the distance between lenses is similar to the distance between eyes, watching this double picture gives impression of three dimensions when you see the left picture with the left eye and the right with the right one – you need some kind of binoculars for it.
Exactly the same trick is made for contemporary 3D movies - there are two views and the glasses you wear in the cinema allow to separate "left" and "right" movie and direct it to the proper eye.
Interesting links:
More about fotoplasticon in Warsaw
Stereoscopy
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