Grace Coulter, a University of Calgary architecture student studying in Barcelona, was looking at the relative success of different physical indications in public squares for an essay project. She decided make her own attempt at changing people's behaviour in a square, in her case with flowers. This video tracks the result. What you can't see, is that her original idea was to try to same technique with eggs! I can only imagine . . .
The video was shot October 18, 2010.