© Over the River (Project for Arkansas River, State of Colorado) Collage 2010 17 x 22" (43.2 x 55.9 cm) Pencil, enamel paint, wax crayon, photograph by Wolfgang Volz, topographic map, fabric sample and tape National Gallery of Art, Washington, D.C., USA (Gift of the artist) Photo: André Grossmann © 2010 Christo

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