No more divisions
The most absurd thing about walls is that they want to divide and isolate when, in reality, they intrigue and stimulate.
Build real or virtual barriers, and people want to see beyond. They are intrigued.
Yet the world's worst politicians have always wanted to build walls to isolate themselves and prevent others from joining them.
I think this is going to be a problem that humanity will carry forever. At least until the day the walls fall on their own because humanity itself will no longer exist.