There are certain forms of street art that can only be seen with a special eye.
A sort of lens, if you will, that picks up the images desired.
Only a small group of people know how to do this type of art, and although you may have seen someone in the process of creating these works, you probably had no idea what they were doing at all.
Bhahah well enough of that proverbial mumbo-jumbo, what I am talking about is light art! Here are a few images of my favorites. enjoy. also a tutorial.