Graffiti artist Tony Quan suffers from amyotrophic lateral sclerosis (Lou Gehrig's Disease) and is unable to move any part of his body other than his eyes. But thanks to an open source computer project called EyeWriter, he can still draw. The technology tracks the movements of his eyes, allows him to select different shapes and colors, and then projects his images onto the sides of buildings. The above video is a selection from a documentary about the project.
Link via Gizmodo