Featured on PDR in the essay Filling in the Blanks: A Prehistory of the Adult Coloring Craze

Its dizzy heights may have passed, but the fad for adult coloring books is far from over. Many trace the origins of such publications to a wave of satirical colouring books published in the 1960s, but as Melissa N. Morris and Zach Carmichael explore, the existence of such books, and the urge to colour the printed image, goes back centuries.