Minor flourishes—soundprooflng Wyoh’s door such as workshop door already had, switching to suppress my instrument or hers, signals to tell me she was alone in her room and door locked, and vice versa. All added up to safe means whereby Wyob and I could talk with Mike or with each other, or could set up talk-talk of Mike, Wyoh, Prof, and self. Mike would call Prof wherever he was; Prof would talk or call back from a more private phone. Or might be Wyoh or myself had to be found. We all were careful to stay checked in with Mike.