Feather - Wikimedia Commons

File:Feather of 'Dendrocopos major' (Great Spotted Woodpecker).jpg

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File:Thumb feather or Alula of Eurasien Jay horizontal.jpg

Close up of a peacock feather. Wikimedia Commons. Public domain.

The Baleful Head, 1887. Edward Burne-Jones (1833–1898). Wikimedia

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File:Feather narrow.png - Wikimedia Commons

File:Peacock with open feathers.jpg - Wikimedia Commons

PDF) Sublime Symmetry: Mathematics and Art.