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In page Lady Standing at a Virginal:

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The identities of the paintings on the wall are not certain, according to the National Gallery, but the landscape on the left may be by either Jan Wijnants or Allart van Everdingen. The second painting, showing Cupid holding a card, is attributed to Caesar van Everdingen, Allart's brother. This motif originated in a contemporary emblem and may either represent the idea of faithfulness to a single lover or perhaps, reflecting the presence of the virginal, the traditional association of music and love.[1]