I want to direct the attention of my readers on an apparently insignificant detail. We are in the wonderful Farnese Gallery; on the right side of the central ceiling fresco "Triumph of Bacchus and Ariadne" there is "Mercury and Paris". Mercury is falling from the sky and is shown overturned and then his genitals, in particular the testicles, are moving downward partially covering the penis. I think it's an example of realism that you would not expect in such idealized vision. Basically it's the same type of realism that we can see in the "Butcher's shop". Realism was not exclusive privilege of the Caravaggesque painters.