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Signed (bottom right) and numbered (bottom left), in pencil, with drystamp of the publisher. American sculptor Alexander Calder was fascinated by movement and balance throughout his mechanical engineering and artistic careers. Often credited with inventing the mobile, the artist utilised his scientific knowledge of forces to create works that seemed to defy logic. His favoured sketching mediums were wire and pliers; he carried them with him as though they were pen and paper for when inspiration hit.