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.