I saw a program on telly about how they'd done this to some skyscraper. Maybe the Sears tower in Chicago??
They've fitted some glazed boxes on the outside of the observation floor, the clever bit being that they can be retracted into the building for cleaning purposes.
So that's a box made completely of glass, a considerable distance in the air. I got quite uncomfortable just watching them on the telly, not sure I could bring myself to actually walk into one and I'm very sure that looking down in one would bring on a severe attack of the heebie-geebies.
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