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From the author of the last post comes this fantastic collection of manuscript illuminations. There's a solid introduction to the practice and each illustration has an explanation that honestly isn't quite as interesting. Lately my Twitter feed has been full of people posing illuminations but unfortunately they don't often give sources - this book doesn't lack for such detail. I heard somewhere that "illumination" strictly speaking only refers to ones with gold or silver since they catch the light when the page is turned, or maybe that's just the original meaning.