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What inspired that furry figure in the corner of Rembrandt’s celebrated painting? Researchers at the Rijksmuseum say they’ve solved the longtime mystery.

By Nina Siegal

Reporting from Amsterdam

It can be hard to make out the dog in the lower right-hand corner of Rembrandt’s monumental group portrait, “The Night Watch.” The paint has faded over time, and the dog falls into shadow, so its outline appears like just a blotch on the canvas.