the whole floor of the CN Tower is glass. It's stronger that way since glass is a liquid (well, technically an amorphous solid), it flexes better in high winds. When it first opened they had it all uncovered but no one would get off of the elevator so they covered most of it with carpet, leaving only the 15 sq m uncovered that's up there today.
Scares the crap out of me.
- Visit the Canadian Opera Blog:
http://canadianopera.blogspot.com/