In the early 1960s, some unusual paintings featuring a person or animal with huge, sad eyes became popular. Some considered the work “kitschy”—or tacky—but others delighted in it. As the artist’s husband began to promote his wife’s creations, the couple grew quite prosperous. But the artist’s signature—Margaret Keane—didn’t appear on her work. Instead, Margaret’s husband presented his wife’s work as his own. Margaret fearfully remained silent about the fraud for twenty years until the couple’s marriage ended. It took a courtroom “paint-off” between them to prove the true artist’s identity.

The man’s deception was clearly wrong, but even as followers of…