Essen once was the key location of Germany's steel industry. Stadtzeichen "Steel", logically consists of steel and underscores the value of that product for Essen's prosperity. Four steel columns holding up two roller-mounted, crossed steel arches, which reminds of a bridge building.  It doesn't provide a lot of opportunities for street artists and so they mostly inscript the pillars with tags or urban messages like "Keep Up Brother". However, there are more creative players like PILZ, who has converted the sculpture to a mobile in September 2015. Unfortunately it was removed immediately by the cleansing department.