All arts in one
In the survey that I did last weeks, I asked about the activities mostly related to the machiya. Ikebana (flower arrangement) and tea ceremony ended both on the first place. Zen meditation and calligraphy both on the second.
I would have expected that far more people would have chosen for tea ceremony. Not only because I see it everywhere in town, but also because tea ceremony includes all arts.
A lot of unwritten rules, which seem elegant and polite when naturally done. This is an art in itself.