----but it is one of my current engineering challenges. It sways like a buggy whip---which means that square is not square--unless there is no wind. Imagine for a moment a door frame which racks and becomes a parallelogram and not a rectangle as the building sways----but the door hung on that frame remains a rectangle. Designing to prevent anything attached to the structure from tearing itself apart is keeping me up late. I does keep me off the streets