FLU is an multi-user interactive installation, where the spectators' mobile devices are used as tactile controllers to interact in realtime with the visualization.
FLU consists of several pieces of software : controller, server, visualization.
The controller is a small webapp running on the mobile screen, listening for touch events that are sent to the server. It can be saved on the home screen and runs on fullscreen (on iOS).
The server is built with Node.js and Socket.IO, gathering all inputs and getting them to the master visualization.
The visualization is a HTML page that is projected in front of the audience.
All those pieces can be adapted to the event. You could imagine a simple animation, multiplayer games, a animated message board, a collaborative sketchboard, or anything you could dream of.
Second-hand painted wi-fi router
Any computer, running the Node.js server and the visualization
A video projector