Some 15th Century Rainbow Beasts That a Cool Scribe Drew in the Margins of His Book of Hours
More of these images here. I bet this anonymous scribe was so weird and so awesome: the library description of the manuscript cites Border decoration on every page without a full border: one bird, flower, grotesque, piece of jewelry, insect, or, occasionally, a household utensil, in each of the three outer margins, traced and painted on the following verso. [Public Domain Review]