Originally Posted by Dennis Rempel:
I have read about this in magazines and pictures here and still don't get why its called mushroom?
I still prefer more of the overall scene with a conventual layout.
I believe (though I may be mistaken) it's based on the premise that part of the layout hangs over other parts, like a mushroom cap.
Take a look at moed321's graphic. I see a mushroom in the 2 "T" shaped areas the elevated figures are standing in. (it's less pronounced in the graphic included in Matt's post since it's not a symmetrical overhang in the illustration)
-Dave