tuppaware_001 / Flickr / Creative Commons

China has a graffiti problem.

Or, more specifically, The Great Wall has a graffiti problem.

It’s not really surprising that people have visited the Great Wall for centuries and left their names etched into the bricks—it’s what people do. The Chinese approach to managing this graffiti may be more clever than functional, but it does suggest that we don’t always need buckets of grey paint.