After the quite successful entertainment brought by the Sefli machine on the Juggling Convention, I had to modify a bit the functionality for the Open Geneva Hackathon.

There is a big countdown of 10 second once you press the button. You don't know when the picture is taken during this interval. It is like a lottery, sometime the printed ticket don't show your face but the one of someone else with the text "find who's on the picture !"