Even the wild idea occurred to me that Gilbert perhaps perceived steganography (or a similar ‘picture in picture’ method) in @Zoli76’s original image (buildings, people, escalator), assuming the image comes from the net. Because my screenshot was well described.
But this “fingerprint identifier” really went off track 
Or maybe @Donat will refute it well, that this is nonsense and I should rather remain silent, and only the heatwave affected Gilbert 