When I first met David, I asked him how he had figured out these theories.  He responded that he had listened to his clients. I went back to my job from that workshop determined to listen with a different ear.  Sure enough, the first client of the week said in his introductory sentence, “I’m here because I have a wall.”  Stunned, I tried to think of the “right” David Grove question to ask him.  Seeing the client look at me through his hands which he was clearly placing on his “wall” between us, I blurted out, “Is it a glass wall?”  The gentleman gave me a strange look and said, “No, it is Plexiglas.”  I had to laugh because of course no one would create a glass wall for protection.  But Plexiglas was a brilliant choice – hard AND see- through.