One day wandering in Paris, taking a stroll with no particular destination, I came across a group of workers spray painting signs on the sidewalk to indicate the path of new utilities.
A few days later, dressed in overalls and with a hard hat, armed with a set of the same spray cans that are used building sites, I selected a busy intersection and, the sidewalk being my canvas, I quickly created a series of intertwined fake itineraries, mimicking a soon to open construction site.
Since the painting necessarily needed to be completed in quite a hurry, I had done a bunch preparatory sketches to help me achieve a satisfactory aesthetical result.
The drawing was deliberately confusing and some shop owners were quite concerned.
Obviously I was unable to explain them what was going on.
A coule of thunderstorms were sufficient to restore the pavement to its original appearance.