Multilayered Stencil Art. A bit of spray paint, a few thin sheets of paper, an x-acto knife, Photoshop/Gimp software, and your imagination.
One of many projects I would like to try. From the looks of it, it appears that most of the work lies in the preparation: image setup & stencil creation.
If anyone has created these before and would like to share some insight, please do!