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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....
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....
Dammit Pratchett, you snuck some culture into me AGAIN you tricky bastard!