I discovered Centered Riding by Sally Swift through Twitter user Alexandria Nenakis. This 1985 equestrian guide uses bizarre illustrations to convey metaphors for the physical activities involved in riding a horse successfully.
Swift had a way with words and her illustrator, Jean MacFarland, could convey those unusual metaphors with an imaginative spirit.
Don't crush the birds in your hands or smash them together like cymbals.
Excuse me, sir, but my eyes are down here.
-via Super Punch