The present version of this text dates from 1995 and is translated here into English or the first time. It was written in the context of special research into 'natural constructions' by the Deutsche Forschungsgemeinschaft, and has previously only been available in German and as a working paper for circulation between those involved in the research project.

Stuttgart 2009. 112 pp, Illustrated with b/w photographs and diagrams, 160mm x 220mm £18.90

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