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Are you Claus Mattheck, author of the books below?
Stupsi Explains the Tree by Claus Mattheck Body Language of Trees by Claus Mattheck Design in Nature by Claus Mattheck Tree Mechanics Explained with Sensitive Words By Pauli the Bear by Claus Mattheck The Body Language of Trees by Claus Mattheck STUPSI- Explica-nos a Árvore by Claus Mattheck Denkwerkzeuge nach der Natur by Claus Mattheck Updated Field Guide for Visual Tree Assessment by Claus Mattheck Trees by Claus Mattheck Pauli explains the form in nature by Claus Mattheck


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