Tom Thomson, Northern Spring, 1915. Oil on wood, 21.6 x 26.8 cm. National Gallery of Canada, Ottawa, Ontario.
Drawing by Henri Matisse. From The Natural Way to Draw by Nicolaides.
Frederick L. B. Bedwell, Crooked Reach, Straits of Magellan, 1869. Watercolour, 17.5 x 25 cm.
Vintage red sea fan print.
Laurie Andrews, Dicksonia Antarctica, 2008. Watercolour.
Ammonite by dbhe
Egg by dbhe
Etienne-Jules Marey, Le Vol des Oiseaux (The Flights of Birds), c. 1882-1885. Silhouettes of different birds and bats, obtained with photographic gun.
premierepage:

http://www2.biusante.parisdescartes.fr
Vincent van Gogh, Allotments on Montmartre, 1887. Oil on canvas. Stedelijk Museum, Amsterdam.
Albrecht Dürer, A Quarry, 1495. Watercolour on paper.