Trochilidae–Kolibris from Kunstformen der Natur (1904) by Ernst Haeckel. Original from Library of Congress. Digitally… Free Image from public domain license 
Insects and Flowers (Qing dynasty ca. 1644–1911) by Ju Lian. Original from The Getty. Digitally enhanced by rawpixel. Free Image from public domain license 
Cerfs et arbres, papier peint. Écureuil oiseaux et sorbier, bordure from L'animal dans la décoration (1897)… Free Image from public domain license 
Sempervivum Canariense Image from Histoire des Plantes Grasses (1799) by Pierre-Joseph Redouté. Original from… Free Image from public domain license 
Star-glory Morning–glory (1827) by Pierre-Joseph Redouté and Henry Joseph Redouté. Original from The… Free Image from public domain license 
Bowles's new pocket map of the world: laid down from the latest observations and comprehending the new discoveries to the… Free Image from public domain license 
Iris Pumila from The genus Iris by William Rickatson Dykes (1877-1925). Original from The Biodiversity Heritage Library.… Free Image from public domain license 
Avocado (Persea) (1916) by Amada Almira Newton. Original from U.S. Department of Agriculture Pomological Watercolor… Free Image from public domain license 
Card Depicting Flowers in Blue Background (1865–1899) by L. Prang & Co. Original from The New York Public Library.… Free Image from public domain license 
Noua, et integra uniuersi orbis descriptio (1531) by Oronce Finé. Original from Library of Congress. Digitally… Free Image from public domain license 
Four diagrams of Solar eclipses (1711) by Johannes Buno. Original from Library of Congress. Digitally enhanced by rawpixel. Free Image from public domain license 
Cygne sauvage from L'animal dans la décoration (1897) illustrated by Maurice Pillard Verneuil. Original from the The… Free Image from public domain license 
Natural History Ensemble, no. 7 (1596–1610) by Anselmus Boëtius de Boodt. Original from the Rijksmuseum. Digitally… Free Image from public domain license 
Lemon (Citrus Limonium) illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own 1892… Free Image from public domain license 
Indian peafowl (Pavo Cristatus) illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own… Free Image from public domain license 
3. Blue crab (Lupa decanta) illustration from Zoology of New York (1842–1844) by James Ellsworth De Kay. Original from… Free Image from public domain license 
The Boston Pine Strawberry (1852) by Charles Hovey, a vintage illustration of fresh strawberries. Digitally enhanced from our… Free Image from public domain license 
Indian tobacco (Lobelia inflata) from Illustrations of Himalayan plants (1855) by W. H. (Walter Hood) Fitch (1817-1892). Free Image from public domain license 
Chimpangze (Troglodyte Chimpanze) illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from our own… Free Image from public domain license 
Le Ballon by Imprimeur E. Pichot. Original from Library of Congress. Digitally enhanced by rawpixel. Free Image from public domain license 
Chinese pattern from L'ornement Polychrome (1888) by Albert Racinet (1825–1893). Digitally enhanced from our own… Free Image from public domain license 
Antique watercolor illustration of nettle butterfly in various life stages published in 1824 by M.P. Original from New York… Free Image from public domain license 
May Picture (1925) by Paul Klee. Original from The MET Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
The Harbinger of Autumn (1922) by Paul Klee. Original from Yale University Art Gallery. Digitally enhanced by rawpixel. Free Image from public domain license 
Temple Gardens (1920) by Paul Klee. Original from The MET Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
Heitere Gebirgslandschaft (Joyful Mountain Landscape) (1929) by Paul Klee. Original from Yale University Art Gallery.… Free Image from public domain license 
Wreath of Laurel, Palm, and Juniper with a Scroll inscribed Virtutem Forma Decorat (ca.1474–1478) by painting in high… Free Image from public domain license 
Studies of Summer Flowers (ca. 1848) painting in high resolution by Jacques–Laurent Agasse. Original from The Yale… Free Image from public domain license 
Red green and Violet–Yellow Rhythms (1920) by Paul Klee. Original from The MET Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
I Saw the Figure 5 in Gold (1928) painting in high resolution by Charles Demuth. Original from The MET Museum. Digitally… Free Image from public domain license 
Boy in Fancy Dress (1931) by Paul Klee. Original from The MET Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
Studies of Flowers (1848) painting in high resolution by Jacques–Laurent Agasse. Original from The Yale University Art… Free Image from public domain license 
Retour (1897) print in high resolution by Georges de Feure. Original from The Cleveland Museum of Art. Digitally enhanced by… Free Image from public domain license 
Persische Nachtigallen (Persian Nightingales) (1917) by Paul Klee. Original portrait painting from The Art Institute of… Free Image from public domain license 
Colorful Architecture (1917) by Paul Klee. Original from The MET Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
Statue of Liberty (1916) from Postcards: New York Series I in high resolution by Rachael Robinson Elmer. Original from The… Free Image from public domain license 
Red Poppies (1929) painting in high resolution by Charles Demuth. Original from The MET Museum. Digitally enhanced by… Free Image from public domain license 
Northeaster (1895) by Winslow Homer. Original from The MET museum. Digitally enhanced by rawpixel. Free Image from public domain license 
Boomrijk landschap painting in high resolution by Georges de Feure (1878–1943). Original from The Rijksmuseum.… Free Image from public domain license 
Vintage Flower Illustration (1899) print in high resolution by Edward Penfield. Original from Library of Congress. Digitally… Free Image from public domain license 
Woman holding cats (1898) print in high resolution by Edward Penfield. Original from The New York Public Library. Digitally… Free Image from public domain license 
Ginevra de' Benci (ca.1474–1478) painting in high resolution by Leonardo da Vinci. Original from The National Gallery… Free Image from public domain license 
Sailing off Gloucester (ca.1880) by Winslow Homer. Original from Yale University Art Gallery. Digitally enhanced by rawpixel. Free Image from public domain license 
The Large Cow Lying Down (1929) print in high resolution by Ernst Ludwig Kirchner. Original from The National Gallery of Art.… Free Image from public domain license 
Winter Landscape in Moonlight (1919) painting in high resolution by Ernst Ludwig Kirchner. Original from The Detroit… Free Image from public domain license 
In the Garden (1874) by Winslow Homer. Original from The National Gallery of Art. Digitally enhanced by rawpixel. Free Image from public domain license 
Tiger in a Cave (ca. 1814) painting in high resolution by Jacques–Laurent Agasse. Original from The Yale University Art… Free Image from public domain license 
Woman holding book (1896) print in high resolution by Edward Penfield. Original from Library of Congress. Digitally enhanced… Free Image from public domain license 
Northeaster (1895) by Winslow Homer. Original from The MET museum. Digitally enhanced by rawpixel. Free Image from public domain license 
Jane Avril (1899) print in high resolution by Henri de Toulouse–Lautrec. Original from The Sterling and Francine Clark… Free Image from public domain license 
College crews (ca. 1908) print in high resolution by Edward Penfield. Original from Library of Congress. Digitally enhanced… Free Image from public domain license 
Vanitas Still Life (ca.1665–1670) painting in high resolution by Jan van Kessel. Original from The National Gallery of… Free Image from public domain license 
Man and woman on street (ca. 1890–1907) print in high resolution by Edward Penfield. Original from The New York Public… Free Image from public domain license 
Piano Mover's Holiday (1919) painting in high resolution by Charles Demuth. Original from The Barnes Foundation. Digitally… Free Image from public domain license 
Angel Applicant (1939) by Paul Klee. Original from The MET Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
In the Spirit of Hoffmann (1921) by Paul Klee. Original from The Minneapolis Institute of Art. Digitally enhanced by… Free Image from public domain license 
Bern with Belltower (1935) painting in high resolution by Ernst Ludwig Kirchner. Original from The Minneapolis Institute of… Free Image from public domain license 
La source du Mal (The Source of Evil) (1894) print in high resolution by Georges de Feure. Original from Minneapolis… Free Image from public domain license 
Woolworth Building June Night (1916) from Postcards: New York Series I in high resolution by Rachael Robinson Elmer. Original… Free Image from public domain license 
Zebra (1803) painting in high resolution by Jacques–Laurent Agasse. Original from The Yale University Art Gallery.… Free Image from public domain license 
Two–masted Schooner with Dory (1894) by Winslow Homer. Original from The Smithsonian. Digitally enhanced by rawpixel. Free Image from public domain license 
After Sir Christopher Wren (1920) painting in high resolution by Charles Demuth. Original from The MET Museum. Digitally… Free Image from public domain license 
Clouded Leopards (ca. 1825) painting in high resolution by Jacques–Laurent Agasse. Original from The Yale University… Free Image from public domain license 
Two Parrots on a Barren Tree (ca.1916) by Charles Demuth. Original from Yale University Art Gallery. Digitally enhanced by… Free Image from public domain license 
Machinery (1920) painting in high resolution by Charles Demuth. Original from The MET Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
C.–C. = Fisch (1931) by Paul Klee. Original from The Minneapolis Institute of Art. Digitally enhanced by rawpixel. Free Image from public domain license 
Snap the Whip (1872) by Winslow Homer. Original from The MET museum. Digitally enhanced by rawpixel. Free Image from public domain license 
Eagle Head, Manchester, Massachusetts (High Tide) (1870) by Winslow Homer. Original from The MET museum. Digitally enhanced… Free Image from public domain license 
Cats under a tree (1898) print in high resolution by Edward Penfield. Original from The New York Public Library. Digitally… Free Image from public domain license 
A Lady's Grey Hunter (ca. 1806) painting in high resolution by Jacques–Laurent Agasse. Original from The Yale… Free Image from public domain license 
Monogram vintage calligraphic Sultan’s insignia, remixed from original artwork by Sultan Süleiman the Magnificent Free Image from public domain license 
The Visit - Couple and Newcomer (1922) painting in high resolution by Ernst Ludwig Kirchner. Original from The National… Free Image from public domain license 
Le Cirque Corvi (ca. 1893) painting in high resolution by Georges de Feure. Original from The Sterling and Francine Clark Art… Free Image from public domain license 
The Sofa (ca.1894–1896) painting in high resolution by Henri de Toulouse–Lautrec. Original from The MET Museum.… Free Image from public domain license 
Undertow (1886) by Winslow Homer. Original from The Clark Art Institute. Digitally enhanced by rawpixel. Free Image from public domain license 
Head of Buddha (1943) print in high resolution by Reijer Stolk. Original from the Rijksmuseum. Digitally enhanced by… Free Image from public domain license 
College rowing club (ca. 1907) print in high resolution by Edward Penfield. Original from ThLibrary of Congress. Digitally… Free Image from public domain license 
Ride a Stearns and be content (1896) print in high resolution by Edward Penfield. Original from Library of Congress.… Free Image from public domain license