Jean-François Millet: The Angelus Prayer, 1859.
As infinitely reproduced as the angels of Rafael’s Sistine Madonna. Dalí was obsessed with it: He was certain that the painting depicted not a prayer, but the funeral of the couple’s child. Eventually the museum relented and had it x-rayed over at the Louvre’s lav. Some accounts would have you believe that they found an overpainted coffin, child-size – in fact there is an overpainted shape, but hardly a clearly distinguishable one.