“Urban art” refers to complex wall designs created by artists, many of whom have years of experience and apply impressive techniques. Graffiti is mostly text but is often enhanced with images. Street art is more heavily image-focused and relates to the local area. It can, but need not, have a political dimension. Instead, it aims to get people thinking, to entertain, provoke and amuse. The artists often express their own feelings through their works. A concrete wall may therefore be the backdrop for a sombre picture or, on the other hand, for colourful, balloon-like letters. Graffiti and street art are constantly being renewed and sprayed over, and the hotspots are therefore changing all the time. Most spray-painters are aware of the ephemeral nature of their works and always have a supply of new and impressive motifs on hand.