Restorer Christoph Schoelzel explains his work during a press preview of a conservation project of the internationally well-known and venerated painting 'Girl Reading a Letter at an Open Window' by Johannes Vermeer (1632??"1675) in the Gemaeldegalerie Alte Meister in Dresden, eastern Germany, Tuesday, May 7, 2019. In 1979, an x-ray image of the work revealed a completely overpainted 'picture in the picture' showing a naked Cupid on the wall of the room in the background. Today, new laboratory tests have conclusively determined that the overpainting was not by Vermeer's hand. (AP Photo/Jens Meyer), APTOPIX