Alphonse Mucha - images from Le Pater
Mucha considered his publication Le Pater to be his printed masterpiece, and referred to it in The Sun of 5 January 1900 as what he had “put [his] soul into”. Printed on 20 December 1899, Le Pater was Mucha’s occult examination of the themes of The Lord’s Prayer and only 510 copies were produced.
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Personally, I think this sort of stuff is more interesting than the usual 4 Seasons stuff.