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As theoretical person who plays and thinks about violins, the question of what wood is led to this peculiar formulation. It appears to me that damping is a very important part of the wood properties. And included porosity in wood is only discussed implicitly as density. Thinking of wood as a foam has helped me when thinking about violin graduations. So: Wood is a lignin foam with cellulose fiber reinfocement, and hemicellulose filler. And the fact that it is a foam containing a lot of air is important to understanding how it works in violins. The nothing is as important as the something!