Dispatchwork

German artist Jan Vormann started by fitting some LEGO bricks into a cracked wall while at an art festival in Bocchignano, Italy, and a movement was born. According to his manifesto ...

... Dispatchwork aims to seal fissures in broken walls worldwide, completing the material compilation in urban constructing and adding color to the urban greyscales, by inserting a very basic construction-material:Plastic Construction Bricks (PCBs)...
... Dispatchwork does not defy deterioration. Rather, it aims to emphasize transitoriness as a chance for the construction and reconstruction of our environments. Adapting to various cities, the project infiltrates walls of cultural heritage, historic facades, fortifications and yet many more less spectacular corners as a colorful repair of shabby walls within our shared spaces.
Dispatchwork contradicts and satirizes the superimposed seriosity of constructions in the cityscape. ... The project also aims to put the focus on the playful, hands-on aspects of creation in our daily lives, and further, on the possibilities for participation to construe and design our own reality.

In a very public and collaborative art project, Jan has traveled the world filling in gaps and cracks with LEGO bricks, often rebuilding crumbled sections of walls and buildings. In many places he has been invited by museums to organize workshops where he takes teams of kids of all ages out to bring color to their city. And he's inspired others. You can organize your own urban Legoization project. Check out his forum to meet up with others to gather in your city, with projects found on six different continents. Here are just four examples, from Tel Aviv, New York City, Berlin, and the Great Wall of China.