Opphos-a participative light and sound show using mobile phones in crowds

Opphos is a mobile application that creates participative light and sound shows by usin g and coordinating the screens and speakers of smartphone s of people in crowds. These shows are made up of waves of color and sound that are generated by the cheers and movements of the participants. Opphos is built on a peerto-peer network middleware that provides communication between mobile phones in large crowds, where standard cellular networks would not be available or sufficient.