Virtual graffiti in augmented reality

A smartphone app that allows you to draw graffiti on the walls of public places using the phone's motion sensor and camera to record the movements and the phone's GPS to record the location. Users and friends can see their graffiti on their phone screens, when the camera is pointed at a particular place, or through augmented reality glasses. As the graffiti can be shared with friends but is only visible in the location (or optionally online) it creates a new mode of personalised location-based communication.