Thinking of that thing which an animal body is built around, porous but rigid, consisting mostly of calcium compounds, and usually containing (solid and liquid portions of) marrow, but in this raptor's wing support strut, just a gas, air:
(from a book by John Z. Young, drawn from a photograph in D'Arcy Thompson's "On Growth and Form")
I dig platonic solids. Known by sounds "thy-o-Dor" IRL.
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