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.
Tange put Tsukiji as the centre of his plan, which now seems grandiose and delusional. His design for the Dentsu building had much in common with the Metabolist philosophy of the 1960s, which maintained that buildings needed to continually evolve in a flexible way.
...With [the Nakagin Capture Tower], Kurokawa's Metabolist philosophy was fully realized. After it was completed, however, it became almost impossible to switch over the capsules - indeed, since its completion, not one of the capsules has been moved. As a result, the Metabolist movement has been forgotten. Yet its core principles, which sought to draw architectural lessons from living organisms, has much inspiration to offer society today.