You can’t turn on the TV or go online at the moment without seeing a mural. Whether they are in car adverts, backdrops to photoshoots or decorating the offices of the world’s leading companies, they seem to be everywhere. They have always been an effective way of making a point in a very visual way that anyone can understand, from the religious murals of the Renaissance to the political murals of the deep South and Northern Ireland; large scale art doesn’t just decorate blank walls, it gets people looking up and taking notice.