This blog post here by lovely Molly of Remedial Eating got me thinking about gargoyles... and peg dolls.
Toward the bottom of the post, you will see a photo of peg dolls created by Molly's son based on the four elements: earth, fire, wind, and (not pictured) air. Peg dolls in the guise of the four elements led me to ponder a uniquely medieval concept: the four humors. Blood, phlegm, bile and... what was the fourth one... earwax? Ah, yes. That would be blood, phlegm, black bile and yellow bile (musn't forget about black bile).