Eron Davide, italian grafitti artist, came up with a beautiful project called "Soul of the Wall", which consists of amazing, subtle grafitti of people on the walls. Eron is very talented and the result of this project is simply majestic and eerie. It definitely has a supernatural feel to it, which is amazing.
These are only a handful of Eron's work. For more of it, please visit his Instagram and follow him! I hope you enjoy these. Cheers! ;)