Walking technique of the horse: trot and gallop from Weltall und Menschheit (1900) by Hans Kraemer. Digitally enhanced from… Free Image from public domain license 
Fahrrader 1 (1894) from the German series, Meyers Konversations Lexikon, a black and white lithograph of different types of… Free Image from public domain license 
Illustration of a black antique carriage (1885), a vintage drawing of a coach from an issue of the very scarce coach-maker’s… Free Image from public domain license 
Human Monkey and Ape skulls from Volledige Natuurlijke Historie der Zoogdieren(1845) by schinz de Visser. Digitally enhanced… Free Image from public domain license 
Skull of a cow (1816) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Skull of a cow (1816) by Jean Bernard (1775-1883). Original from the Rijks Museum. Digitally enhanced by rawpixel. Free Image from public domain license 
Feather by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. Free Image from public domain license 
Vintage llustration of skull published in 1843 by John Lloyd Stephens (1805-1852). Original from New York public library.… Free Image from public domain license 
Merry Christmas lithograph (1876) published by Currier & Ives. Original from Library of Congress. Digitally enhanced by… Free Image from public domain license 
Christmas card depicting children and holly from The Miriam and Ira D. Wallach Division of Art, Prints and Photographs:… Free Image from public domain license 
Vintage moose illustration from The Polar Regions of the Western Continent Explored (1831) by William Joseph Snelling.… Free Image from public domain license 
Vintage sleigh etching illustration from Travels in Various Countries of Europe, Asia and Africa (1810) by Edward Daniel… Free Image from public domain license 
Vintage winter bird etching illustration from The Baby's Museum; or, Rhymes, jingles and ditties, newly arranged by Uncle… Free Image from public domain license 
An angel holding a Christmas bell (1912) from The Miriam and Ira D. Wallach Division Of Art, Prints and Photographs: Picture… Free Image from public domain license