...and what else?...let me see....memento mori, anybody?...see previous post....go figure:

anyway, I would guess that it is not too 'taxing' to work it out....i.e. costin had figured that he had gained control of 'crap taxidermy'....see previous notes upon the masons' devil etc etc...

https://www.metmuseum.org/art/collection/search/130732