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.
A special contribution of Zen to Eastern thought was its recognition of the mundane as of equal importance with the spiritual. It held that in the great relation of things there was no distinction of small and great, an atom possessing equal possibilities with the universe. The seeker for perfection must discover in his own life the refection of the inner light. The organization of the Zen monastery was very significant of this point of view. To every member, except the abbot, was assigned some special work in the caretaking of the monastery, and curiously enough, to the novices was committed the lighter duties, while to the most respected and advanced monks were given the more irksome and menial tasks. Such services formed a part of the Zen discipline and every least action must be done absolutely perfectly. Thus many a weighty discussion ensued while weeding the garden, paring a turnip, or serving tea. The whole ideal of Teaism is a result of this Zen conception of greatness in the smallest incidents of life. Taoism furnished the basis for aesthetic ideals, Zennism made them practical.