This is a stereoscopic image. You can view it in 3D with a smartphone and VR googles.
Abstract:
Claus-Christian Carbon at University Bamberg, in front of La Gioconda (left: Prado, right Louvre)
Prof. Carbon is the author of a [https://experimental-psychology.de/ccc/docs/pubs/CarbonHesslinger_MonaLisa_inpress.pdf scientific paper], whose main point is, that the version of the Mona Lisa from the Prado and the version from the Louvre (both painted at the same time in da Vinci's studio) together form a 500 year old stereogramCategories: Claus-Christian Carbon, Markusplatz 3, Ehemaliges Entbindungshaus (Bamberg)