Each spectator connects with his smartphone (iPhone and Android compatible) to a website, communicated on site or in advance.
The viewer selects from the proposed themes (adapted to the time of year: Christmas, Halloween…, or more general: jungle, ice floe, frost, space…) the one he wants to put on the facade.
He waits for his turn (so that the maximum number of spectators can participate to the experience, everyone is given a playing time of 30 seconds to 1 minute).
When their turn comes, the viewer sees their theme appear on the projection surface and can add predefined video sequences on their smartphone as they want.
The organizer keeps control of the projected content:
themes and videos are validated in advance.
The spectator plays with the pre-programmed sequences.