Some of my favorite “street art” is the type that occurs naturally, unplanned, with no single artist responsible. It’s the collage-like effect created by the little bits of postings and ads left behind and piled upon each other on billboards and plywood throughout the city. It’s actually been a longtime (unfulfilled) plan of mine to try to recreate this effect on a wall in my home. New York based photographer Mark Hartman has honed in on this very subject matter in his personal photo series project titled Billboards. He describes himself as curator, picking and choosing specific parts of these shredded walls, beautifully cropping and photographing them.