An article I found very helpful when I first came to the board was this one:
[
www.u.arizona.edu]
It describes the effect of the room setup in Landmark (same as in most lgats - to a T) and it really astounded me because I was totally unconscious of the effect of the physical room structure. I noticed it was a bit anal but I thought ah well, it takes all types. This article really illustrates how physical environments have an unconscious effect on the mind and emotions.
It has already been discussed on this board in several places, and is a bit of a heavy read, but I think its worth reviving in light of this topic.
The very fact that est, Landmark, Quest and no doubt most of the others copy the layout of chairs (measured to centimeters), position of pens on a table, etc shows how important it is to the manipulation.