Yesterday I found the perfect place to do some tests runs, the wall of an abandoned church. I might need a more powerful laser since Chicago is just too lit up. It is hard to take a long exposure for more than 1 minute without overexposing it. 

This is the process made on a longer project which attempts to draw long exposure light drawings with lasers using skyscrapers as canvas.

Laser graffiti! 

The idea is simple, with a pair of servos, an arduino and a laser, draw images on the surfaces of tall buildings (oh and a long exposure camera), here some progress.