We build walls inside ourselves when we feel vulnerable or under attack. When this occurs we shut people out, we certainly are not kind to people who have hurt us, and we're alone and left to wonder what the hell happened, why is the world against us, or what's wrong with us.
The reverse of this card can mean these same things mentioned above but to a lesser degree. Do not get trapped behind a wall of defense - look beyond the wall and confront the adversary and deal with the issues that separate you and the other party. Be confident and speak your grievance but also listen to the other party as you might be doing something subconsciously add strain to the situation.
