Thinking about walls

My walls project is in its early stages, to be sure, but I´ve been musing a little lately about what all of it means. What do these various walls have in common? What do they tell us?

At first I was thinking that these walls are simply expressions of fear, but I think that might be too simplistic a take. I wonder, instead, if the walls are monuments to failure. They represent a lack of ideas and of imagination. The walls are not solutions, but are a manifestation of the failure to find a solution.

Any thoughts?