Graffiti has been an integral and vibrant part of many cultures across the globe and has told (and continues to tell) stories encompassing every facet of the human condition. It has always been controversial — from the prehistoric petroglyphs, to the rude marking in Pompeii, to the chalk "tags" scribbled on the Reichtag by Russian soldiers, to the social and political protest of contemporary artists such as Banksy.

Images from the Berlin Wall projected onto serrated rusted steel slats are symbolic of how graffiti has been and continues to be a rich window into the diversity of people, cultures and issues across the globe.