Street art thrives at the edges of modern society. Generally poorer areas get more their share of volunteer art. Undoubtedly some of this is inadvertent editing; the richer areas can afford the cost of cleaning every mark off of a wall as soon as they appear. There’s also the motivation of a larger pool of the young and disenfranchised that use the walls of a city to express themselves. Portugal is and has been one of the poorest countries in Western Europe for decades. Not surprisingly, its capitol Lisbon is a hot bed of street art.