Creepy
It makes sense. Da Vinci and the others were such great artists, it would be easy to find examples of this phenomenon. Look for “un-natural” folds and wrinkles on clothes, and in landscape. Look at the green sleeve in the picture of the lady and the ferret (?) the darkened area does not really look like a ‘natural’ fold in the clothing. Same thing in post 41, athough the picture is a little small for me to confirm. If we look for these anomalies, we may find more.
It’s Billy Mumy from Babylon 5!