iPhone App + Projector Lets You Tag....Well, Anything

F.A.T. creates the illusion of graffiti with an iPhone application and a projector. The best part? There's a HowTo (click through & scroll down).

• Previously, Magical LED Graffiti "Paints" With Video.
• Write With Light.
• How to Make Dripping Street Art.
• Graffiti Bot Tags With Paintball Bullets.
• Robo-Tagger (Unmanned Graffiti).
• DIY Ocular Assault Weapon.