Quoted from MythMaker:This is a good source for anyone in the chicago area. Thanks for sharing! I wonder how many Anthony has left.
The trick to the glass is it is partially tinted. Only the top half contains the tint and it gets darker as it goes up the glass.
It is more complicated than that. The glass is partially mirrored which requires special equipment or exposure to some biohazard type stuff. I can not find the source for this, but it is how I understood it when I researched it.