In the civilized world, we spend life surrounded by walls, and most often we do not care much about them. Walls are an inherent factor we got used to eventually. When we strive to get from A to B, we don't mind to travel through C, if a wall is blocking the direct path. As it is quite human to ignore what offends us, we tend to not look on walls closely. This project is meant to rigorously inspect walls and everything related.
Limit #1 What will block me Sunday?
Walls have a hard time to block simple grass from protruding. Maybe that's why green's the color of hope?