This ad hearkens back to the days before billboards. You can see traces of old advertising on older buildings around the city. Often the ads on buildings are for companies or goods that are no longer in existence. Imagine the work of painting these on buildings. They were meant to last - not, as today, rented for a period of time only to be changed when the workers show up again with their paper and glue. And then there are the electronic ads - flashing on screens for moments only to be suplanted by the next one. It's the age of rapid change with anything and everything done to catch your attention, to catch your brain into craving for things.