Hidden images in Mona Lisa by Leonardo da Vinci

Mona Lisa 3User DAHBOO77 on YouTube had an excellent idea (do not know how some of them also come great ideas!) Took the famous picture of the Leonardo da Vinci (perhaps the world), Mona Lisa, and using chart a little program to reverse and applied the phenomenon of mirror ("mirroring" in English). He did the same with the painting "The Last Supper" by Da Vinci ... and the result is incredible. We have obtained new stunning images that seem to have been hidden by the brilliant artist (Da Vinci is known that she adored hide things ... he was a master of disguise).

DAHBOO77 some structures found such an amazing design, but also some very strange faces. At one point (see the first image at the bottom of the article), I observe a huge chip, monster, dark, i can see the body, from the shoulders up, mouth, nose and dark eyes. And above the eyes, it appears that arise horns ... From this juxtaposition also occur faces framed in the pyramids (see also chip over a yellow circle in the second photo). How to master managed to hide so well? The third picture is even more interesting. From the juxtaposition of two images reversed, resulting what appears to be a head. If you rotate the image, resulting image of a dog! I can see clear red eyes, nose and two teeth even! A da Vinci did it on purpose? What did the master to tell us or show us? What other strange things longer hiding Mona Lisa?