A picture book that artist Otto Dix painted for his five-year-old stepdaughter, Hana Koch, is on view in Dusseldorf this month, a rare collection of watercolors that has never been shown.  “Twenty years ago, Hana showed us one page, so we knew it was there,†says Herbert Remmert of the Dusseldorf Galerie Remmert und Barth, where the book is on view.
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