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Li - Dynamic Form in Nature

24 25 frActure cracks in elastic materials Although they bear a superficial similarity, the pattern of cracks appearing in the asphalt paving below are of a different order from those illustrated on pages 2021. The difference lies in the nature of the materials involved asphalt is essentially elastic, pottery glazes are inelastic. Among other characteristics the latter has far more rightangled joints. The fissures found in many treebarks are some of the more familiar examples of fractures in an elastic medium. These fissures arise as a result of tension on the outer bark of the tree that is caused by the growth of its inner core different species have evolved different strategies to resolve this difficulty. The longitudinal cracks in pines opposite top left typically create cells, not unlike those formed in asphalt. By contrast the Sweet Chestnut opposite top right directs the expansive forces into elegant, gently helical system of furrows. Each species has its distinctive li or, one might say, each li produces its distinctive species. Mature trees are also affected by the piling up of new bark material, which deepens and emphasizes the cracks, as in the Oaks lower row opposite.
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