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The Night Watch (Rembrandt)
(lemmy.ca)
Wander the gallery. Look at the art. Be polite. If you feel able please post some great art :)
I mean... It might have been inspiration for the cover....
Dammit Pratchett, you snuck some culture into me AGAIN you tricky bastard!
The Wikipedia article actually makes reference to this
I'm going to have to look at my copy when I get home now. And check if the Koom Valley painting from thud is a reference to anything that actually existed....