Graffiti is a often, and passionately, debated topic. Some consider it to be art, other just sees it as vandalism. But no matter what opinion you might have about it, graffiti is something that has been present ever since the Ancient Egypt, Ancient Greek and Roman Empire.
It is also really, really fun. Expressing yourself with a spray can and a white canvas is .. And no you have the chnace to try it yourself, of course in a completely legal way.
It is also a great team building activity as the team ned to work together and communicate and make decision to create the huge art piece.