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| Franz West, Ein Hod, 2008, epoxy |
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| Richard Tuttle, Mountain, 1965, acrylic on canvas and wood, seen in the Ludwig Museum, Cologne |
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| Hans Arp, Relief Nadir I, 1959, painted wood, seen in the Ludwig Museum, Cologne |
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| Geiger Rupprecht, Gerundetes Rot, in the St. Ludwig church, Ibbenbüren/Westfalen |
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| David Nash, Three Humps, 2011 in Bad Homburg |
