the berlin wall is a cool and graffitied wall. the purpose of this wall is they wanted to split up east and west berlin. this was a barrier to separate the city. it was to keep the East Germans' from escaping. if they try and jump the wall they got killed. In the East they were communists. In communism the government owns everything, including your house, your car, etc. You can't own anything and everything is shared easily. Some people liked this and some people didn't like this and wanted to escape to the west, so the wall was built to stop them. It was 160 km long.