I used to think street art was limited to just graffiti, ugly tags around my neighbourhood scrawled on lovely old Federation shops. Now i know better. The best street artists are the ones who transform those mundane little regularities in life into surprising new experiences. Walking past a drain on your way to the bus, or at a zebra crossing, or waiting at a stop sign. Street art messes with your head by playing with the unexpected. These are some of the very best.