Wow... ideas are just pulsing... Can you imagine scooting the kids out of their beds and down the hall for school whether they want to go or not? Or relaxing to a nice steady shwoosh as new air washed over your face at the end of a long day? Or the horror of a leaky pipe going drip somewhere in the middle of the night? Of course, with nutrients floating by in the walls... snacking would be far too easy. ;^) Heavy flaps are typical of some primitive closures (I'm thinking of hides and tent flaps) and lighter ones in Japanese environments (the cloths that we bow under while passing through), but these are all hinged from above. Getting something to work all the way around would require serious engineering. Meanwhile, I can add this to my trap- and dungeon-building schemes... those cordae tendineae have to be connected somewhere. Carolly