3. Add a traditional Japanese bathtub If you've seen traditional Japanese bathrooms, they probably have something in common: the bathtub. It's distinct in design and is core to aiding a sense of ...

Yuval Zohar, author of "Towards a Nude Architecture," relaxes in Tengunoyu, one of the baths at Kita Onsen hot spring in Tochigi prefecture, north of Tokyo. (All photos and images courtesy of Yuval ...