To see a wall in your dream signifies limitations, obstacles and boundaries. There is a barrier obstructing your progress. Alternatively, the wall indicates that you are too accustomed to your old habits and way of thinking. You feel stuck. If you dream of blood on the walls, then it is a warning of sorts. There is a situation that you need to confront. You can not avoid it any longer.

To dream that you jump over a wall suggests that you are able to confront tough obstacles and get around barriers with success and ease.

To dream that you demolish or break down a wall indicates that you are breaking through obstacles and overcoming your limitations. It also means that you desire some freedom and independence. If you see a wall crumble, then it suggests that you have risen above your problems and overcame your barriers. To dream that you are hiding behind a wall suggests that you ashamed in acknowledging your connections. To dream that you are being thrown or shot through a wall means that you need to literally breakdown those walls that you have put up around you. You need to venture out and explore. 

To dream that you are building a wall refers to a bad relationship or childhood trauma. You are trying to keep others out for fear of getting hurt again. Alternatively, the dream suggests that you have accepted your limitations. To dream that a house has no walls represents a lack of privacy. You feel that everyone is looking over your shoulder or up in your business.