We should note that all of these places of thermal extremes (Finnish saunas, Japanese hot baths, American beaches and mountains) have their opposites close at hand. There are possibly two reasons for having the extremes right next to each other.
The first is physiological: the availability of extremes ensures that we can move from one to the other to maintain a thermal balance.
The second might be termed aesthetic: the experience of each extreme is made more acute by contrast to the other.
Works of art which have great life often have intense contrast within: rough/smooth, solid/void, loud/silent, empty/full. It is the difference between opposites which gives birth to something. Contrast is what often gives other principles their degree of life – the intensity of the boundary, the markedness of the alternating repetition.
Contrast strengthens centers by making each a deeper entity of itself, and thereby giving deeper meaning to both. It is, at its simplest, what allows us to differentiate. But meaningless contrast remains meaningless. It is only when centers are actively, mutually, and meaningfully composed that it acts to deepen the whole.
Both a book and a MoMA exhibition of the same name by Bernard Rudofsky originally published in 1964. It provides a demonstration of the artistic, functional, and cultural richness of vernacular architecture.
In 200 enlarged black-and-white-photographs, he showed various kinds of architectures, landscapes, and people living with or within architectures. Shown without texts or explanations, the visitors were just confronted with imagery that showed indigenous building traditions, which were very much at odds with the ideas of architectural modernism which had been promoted through NYC MoMA's Philip Johnson in his famous 1932 exhibition "Modern Architecture. International Exhibition".