The oldest of these programs is that of the Louvre, which began during the French Revolution in 1793, reportedly just a month after radical Parisians converted the royal palace into a museum. Back then, it was a rule that any artist who wished to enter the museum and copy from the work of the masters would be given an easel to do so—it’s not surprising, then, that among its alumni are familiar names, like Edgar Degas, Pablo Picasso, and Salvador Dalí.