Every person in the room is equipped with a laser pointer, which is used as a kind of mouse. The audience are invited to make choices during the films, by aiming their pointer at a certain zone of the screen.

Several methods of interaction are possible, e.g.:
- stopping the action at a given moment, with a choice between several 'next steps'; the next step chosen is the one pointed at by the most people
- a zone to aim at: either only one for the entire audience, or several zones, requiring collaboration from the audience
- shapes to be reproduced collectively or individually, zone to be coloured by pointers fulfilling the function of virtual pencils, etc.

An infrared camera captures the position of the pointers on the image, tracking software sends the information about these positions to software which reads the film and, depending on the method chosen, activates one of the possible next steps.

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