Here's a smart way to fight public violence: just hold up a mirror.
A big mirror, that is, in the form of a massive billboard that displays the real-time activity of the street below.
But there's a catch. Layer a pre-recorded fight on top of the real video stream, and watch as passerby gawk at their own selves, standing idle as two people start swinging "in front" of them.
The public service project is the brainchild of officials in the Netherlands, where street aggression and violence of public servants is a problem -- as is Dutch citizens' tendency to look the other way when it occurs.
The concept: shame citizens into action by placing them, digitally, in the midst of a violent altercation.