ProjectOpphos – A Participative Light and Sound Show using Mobile Phones in Crowds

Opphos – A Participative Light and Sound Show using Mobile Phones in Crowds

Opphos is a mobile application that creates artistic light and sound effects in order to reflect and enhance the mood and the vibe of an audience during a concert.

This application uses the movements of the spectators and the ambient sounds to generate a crowd-sourced light show that reflects the audience's behaviors during an event. It also generates an extra musical instrument by enhancing and propagating cheers and other sounds coming from the crowd.

The goal of Opphos is to create an immersive and collective emotional experience where each person in the audience plays an important role.

Opphos uses opportunistic networking to spread information among mobile phones in the audience, and it is therefore perfectly functional in environment where a cellular network is not available or insufficient for the crowd.

Depending on the interactions that the user has with the phone (first pumping, swaying and cheering), Opphos can be set to two different modes: The battle mode encourages the crowd to make noise and is designed to help the artist warm up the crowd at the beginning of a concert. On the contrary, the ambiance mode is designed to create a calm and breathtaking light show in rhythm with the swaying movements of the crowd.

This application can be used for concerts, sports gatherings, conferences or any kind of event with small to large crowds



Presentation Video by Iza Marfisi - April 2013



First user experimentation - June 2013

We conducted a first user experimentation on an early version of Opphos with 20 participants. The testers were given phones with the application and were placed in a dark room with the projection of a live concert and without further instructions on what to do. We were very happy to see that the testers naturally engaged in the interactions we had chosen for Opphos: first pumping and swaying with the phones in their hands. The test also allowed us to improve Opphos by adding vibration feedback and by adapting to the different ways the testers held the telephones we had not foreseen. Finally, the interviews sessions gave us some promising results regarding the emotions that the testers felt when using this first version of Opphos (exited, amused, curious…) and the need they felt to engage in a collaborative experience.

opphos interview

Thank you to all the participants !


Another user experimentation is planned for the 28th of August 2013 at the ExtremeCom conference.