Re:Mining Bitcoin with pencil and paper: 0.67 hashes per day
by dragonwriter on Tuesday September 30, 2014 @02:48AM
(#8387029)
A fairly normal spa massage is done unclothed with a towel covering (the client disproves and covers up while the masseur or masseuse out of the room.)
So, while a massage room might have windows, if it does they almost certainly would be covered completely when in use. So no windows isn't odd for a massage room.
I hope that I'm wrong, but I'm suspicious about what happens in there.