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Hi GG. What do walls achieve ? Well, I crossed the Berlin Wall in 1973.The Western side of the DDR was like a spy film, Russian border, deep snow at night. Having crossed the Wall into the East in daytime was like going to another country, no adverts for a start, Russian writing, completely different atmosphere. The first shop I saw mended nylon tights. I got a very strong feeling that the Wall was to keep us Out rather than them In.Time stops when walls are built.They watched western TV although illegal, and wanted the Dallas/Dynasty life they thought we led.Walls stop both sides blending and growing together in my experience,and those on either side are not particularly happy about both the wall being there and the need for one. Much like the walls and fences on our homes I suppose.Same in the old days in Europe with enforced border crossings.I never crossed one without seeing someone carted off.
I love that the Great Wall of China was finally breached simply by bribing the guards, and it's not that high in places. Walls say either you can't come in or you can't go out on that scale to me.