In natural organisms, there are no metals in the form in which at least we know it, good conductors of heat and light, adaptable (with appropriate criteria and processes) to take any form we want. However, there are a lot of oxides and metal salts, starting with silica or silicon oxide, which forms for example frustuli of diatoms, and offers them the porous structure and perfection of photonics, which showed in a previous post, or calcium carbonate, which forms the bones of cuttlefish, for example, by providing them due to their columnar structure with cells more or less rectangular (but with helical symmetry internal) absolute imperviousness to water, and especially for the sea salt.
This is a general concept: all that is linear in nature, is actually born from the superimposition of axial symmetry, such as the external structure of the fibers of celery in the figure.
But the fact of working on metals, from the standpoint of the engineer, had an important consequence: the search for an ideal material, identified with the steel. Or rather: the belief that an ideal material, that is homogeneous and isotropic, quiindi that behaves the same way under all stresses (mechanical, thermal, electromagnetic) on every point, it 's the optimum it was possible achieve.
In truth, then we have seen that nature, but also the engineering had rather need to make the most of the anisotropy of the material because the stresses are only rarely uniform (not even the application of the weight is almost never uniform, for example, no one sits exactly occupying the entire session, no more and no less). E 'to get a fair degree of anisotropy, as required by the reality of things, that nature uses the cellular structures, gradually assembling.
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