The reason behind these terrifying baby-murder Easter Eggs is Holy Roman Emperor Rudolf II, who got his hands on the painting shortly after it was finished, and went: "Shit, that won't do," and had its more controversial parts (e.g. hordes of dead children) painted over.
As for why Rudolf II allowed those "shadows" that eventually revealed the dead infants linger in the painting, well ... we're guessing he didn't. They just kept reappearing every time someone painted over them, because there's no way a painting with this many dead babies in it isn't haunted.
Bill Clinton's Portrait At The National Portrait Gallery Includes A Hidden Reference To Monica Lewinsky
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Whatever you think of his presidency, Bill Clinton's affair with Monica Lewinsky will forever be a stain on the blue dress of his legacy. The Lewinsky scandal has been gleefully captured in countless articles and political cartoons, but its impact on more classical fields of artistry has been slightly more limited.
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Our rock opera, Monica!, is still stuck in development hell.