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.
I do not know what one should call the landscape of a long cultivated countryside, or the enchanting pattern of lights which shows at night time in a modern city seen from overhead. Are these not works of art? It is scarcely justifiable to say that these things have taken shape by chance. Each part of them has been made as it is by what seemed a deliberate act, and it need not necessarily be assumed to be a matter of chance that the results of many acts of many men over a considerably period of time should harmonize together aesthetically.