Update 2018-10-15: Interesting link added.
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The Franz Marc watercolour is very different from this one, it features two horses and is painted in a very different style, using two shades of blue on top of a pencil drawing.
Added: see also the top image on this page from Kazakstan (page and text in Hungarian). I may want to make a version of that one some day, but then it almost looks like I've already done so some centuries ago, in another life.
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