"Are you serious?? Comon, you realy think they wanted to show off level development by showing us 3 orange walls and bars? "
No, they were trying to show ( and you'd have been aware of this if you had a chance to read the article, which you may or may not have) their "Tang Mode" level testing procedure, wherein the level designers do the architecture work first, hash out any problems with the level design and when it's ready, hand it over to the artists to finalize. A very cool idea if you ask me.
I'm a soooooooong from the sixties.