#17: Rolled-Edge Spa
In decades past, comfort wasn't typically uppermost in mind when spas were being designed and built in conjunction with swimming pools.  Jet placements could be arbitrary, walls were almost always set at 90-degree angles to the seats and, perhaps least thoughtful of all, coping was set up pool-style, with grab edges that hit anyone tall enough to get on an amusement-park thrill ride somewhere in the back, shoulders or neck, making it difficult to relax and enjoy the experience. These days, fortunately,