Theme is not original. All these images date back to the engraving Wolgemut Michael (Michael Wolgemut, 1434-1519), performed by them in 1493 for "Nuremberg Chronicle" ("Schedelsche Weltchronik"), is actually the first illustrated encyclopedia of world history. And judging by the position of the legs of skeletons, the author of your pictures could be inspired and Walt Disney cartoon "Skeleton Dance", released in 1929 by the way, Disney does not hide the fact that the cartoon idea occurred to him when meeting with an engraving Wolgemut.
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