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Catching catfish with a gourd (Hyōnen-zu) - Josetsu (1415)
(upload.wikimedia.org)
Maybe a dumb question, but I can’t recognize if the person has a human head or a rat-like one?
Human. He's just pudgy with unkempt hair and a beard. Here's a different scan of the same piece - it's black and white but less artefacted.
Actually looks like he is a catfish catching a cat fish. Maybe along the lines of you are what you eat?
Wander the gallery. Look at the art. Be polite. If you feel able please post some great art :)