When a man comes to the jungle he cleans up a spot and builds his house. The walls of the house and the hard surfaces are constructed to keep the nature out. When man moves away from his house the jungle will come in. Nature reads the house and step-by-step the architecture will become part of nature. But the nature does not want everything. Plenty of space is left for the man to come back.

The third generation condition is a ruin shared by man and nature. Human nature as part of nature. Ruin is when man-made has become part of nature.
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