From Rembrandt to Picasso, here are five ways to spot a fake masterpiece.

Fake news, deepfakes, and identity theft are all over the place. It would be tempting to believe that deceit is a high-tech innovation of the cyber age given how enmeshed we are in a culture of digitalized deceptions, a phenomenon that is being enhanced by artificial intelligence. However, recent disclosures—from the unearthing of a sophisticated, albeit distinctly low-tech, art forger’s workshop in Rome to the dramatic claim that a treasured Baroque masterpiece in London’s National Gallery is a crude replica of a lost original—remind us that art has a long and illustrious history of deceit, one that is written not in binary ones and zeroes but rather in impossible pigments, awkward brushstrokes, and dubious signatures. There is, in fact, the Sun in terms of deception and fakery.