 A specially adapted spray can emits IR light instead of paint, which is then tracked by a computer vision system to recreate the "sprayed" image onto the wall using a projector.Any system that allows art to be created on a large scale in a similar manner to more traditional graffiti falls under the heading digital graffiti.Cisco Systems has released a mobile application called [Digital Graffiti] patented by Cisco Systems, Inc. to allow people to place messages of varying size, color, length of time visible, and viewing distance (say visible from 20 feet away) on a physical location, say a building, an office, a cubicle, or a specific location using their augmented reality mobile application.