Several times over the years I've had an office with a door. Normally I kept the door open, but I would close it if I had work that required extreme (for me) co

Several times over the years I've had an office with a door. Normally I kept the door open, but I would close it if I had work that required extreme (for me) concentration, or if the environment outside was excessively distracting that day, etc. IME, this is quite common for other people as well. Since I have trouble concentrating when people are talking and get quite unhappy about it but managed to keep my door open the vast majority of the time, I have to wonder. Was Bell Labs an excessively noisy place, or were the closed door people there those kind of people?