Maybe the people of this city scryed the annals of time and space and saw this wonder dimly in their orb. Or maybe this town is home to the famed Vacuum Cleaner's Guild, which has made it famous and rich. Possibly they are great believers in the greatness of ordinary tech. Or else their art is going through a richly ironic phase and this is what their choose to celebrate. Maybe they just like vacuum cleaners. Maybe it's just a joke.