Fritz van Uhde, Walking to Bethlehem, 1890. 

Unknown (Catalan painter), Tomb of Don Sancho Saiz de Carillo (detail), 1300.

Unknown (French sculptor), Head of a Woman, 1540.

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Shelagh Delaney

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Paul Klee, In the box, 1908.

Paul Klee, The signatories to the window (The artist at the window), 1909.