Rotating Room?
I'm pretty sure Renstrike IS the bethesda employee. I saw an article saying that a bethesda employee made a map named "RenTest 2"
Yes.
woah!
also, is it an entity or texture for the glass walls used in portal?
a plain regular old glass wall is just a brush with a glass texture applied to the faces you see, and of course nodraw to the rest(including in joints between glass brushes)
Wrong, you should make it into a func_detail!
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Wrong, you should make it into a func_brush!
Func_details implies z-fighting if there is more than two or three glasses next to each other. The engine doesn't know what to render in front or behind each glass.
That's a simple solution, make them all into the same func_detail entity.
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I have found that func_detail has some limitations with regards to glass, or more specifically refracting glass.
I made use of env_fire in one of my maps, and noticed that if the observation room windows were func_detail, the fire was not visible from certain angles through them. When I changed the windows to a func_brush, the fire was visible from anywhere.
Im not sure of the technical reasons for this, but I noticed that valve used func_brush for their windows. Env_fire is not used in Portal, so there may be other effects that do not display correctly through func_detail windows. 
Isn't it used for the
Spoiler tags in place, I don't think this would really spoil anyone here but then again, who knows who reads this forum.
"Duct Tape is the answer."