This study was first published in 1983 in UMRISS, the Viennese journal for architecture (Nr.2/:2-9). Later, in 1987, a modified version, in both English and Japanese, was printed in the Japanese architectural journal >Architecture and Urbanism< (A&U, Nr.197/Feb.). As early as in 1982, this topic was dealt with in a paper entitled >Nest–building of the pongidae - a form of subhuman constructivity?< which was held at the annual meeting of the >American Anthropological Association< in Washington (4.-7. Dec.), in the section >Primatology: Evolutionary Processes?<. The primatologists attending the lecture who instantly realized the potential of the approach presented for human brain development, responded enthusiastically; this, in turn, was a great stimulus for the author to pursue this type of research further.
For the moment, this scheme is merely a hypothesis which awaits its verification in the field. However, what Bollnow termed the "cave character" of dwelling, i.e. the securing of dwelling space by a securable threshold, seems to correspond spatially to a punctual system of - socially occupied - markers, nests for the darker parts of life. If this were so, that is to say, if the assumed paths prove to be correct, we would have uncovered an enormously stable continuum: throughout all known sources and styles, man used a similar structural principle (access-place-schema) to define and form his dwelling and settling space. With a minimum of constructive representation, but of existential importance (nightly rest), it can already be found among the subhuman relatives of man, the higher apes.