...and there had been an acoustic set-up, around the back of that house, hadn't there?

anyway, what else....'vibration of the eyeballs'...see previous notes upon those....whose eyeballs used to 'shake' now and then....Muriel in prague, for example...I was to point it out to her...she didn't even know that she was 'doing it' now and then...at moments of indecision/anxiety/concentration etc etc....