What Gets Left Behind

There are a lot of inter-playing levels of temporary and permanent items here.  The item removed, the instruction, the spray-paint, the structure itself (which is a plywood fence around a construction site); was any consideration given to how long each of these items would stay here?

Other questions I have:

What was removed?

Why was the target removed, but the instruction to remove left behind?

Did the person who wrote “remove” consider the relative permanence of his/her message?