Walls have been notoriously unreliable throughout history, the Greeks had a saying that nations should build their walls with iron - meaning, protect your city with soldiers and not with walls. Historian John Keegan has noted that walls often become irrelevant, and are often bypassed - the French Maginot line, bypassed in WWII, being the most famous example. The Berlin Wall was a sign of Soviet weakness and the coming fall of the East German government and of Communism in general. The wall in Israel is the same kind sign, Israel cannot be accepted as legitimate by the Muslim world, and it has to resort to building a wall (Israeli generals are biting their fists over this I'm sure despite ignorance by the public in general). I hope the world will start to recognize the folly of the creation of Israel before war and violence prove again that walls are only a sign of military weakness.