Amazing work!!!Have you ever thought of making indoor plumbing? Route fresh water from above with clay and bamboo to the inside of the dwelling,then have it designed so that water can only build up so much till it has a certain height that it can overflow and drain somewhere down stream.I've never seen someone work that hard in my life...I think I need a nap now.They don't even talk to each other but their mind and spirit are one when executing the tasks.