Boundaries come in 2 forms. Literal boundaries such as walls, or the more mental boundaries being like that someone doesn’t like people touching their hair, or doesn’t like people fighting. Some mental boundaries are very obvious, such as someone not liking to get stabbed, or can be as fuzzy or unclear as someone not liking putting on dirty socks. The difference between hard and fuzzy boundaries is that hard boundaries are clear and explicit, while fuzzy boundaries are unclear and could change in the future.