Boundary within building design involves factors like layering, filtering, and opening or closing. It is a way for you as an architect to communicate to your occupants about where they were, where they are, and where they are going. While boundaries do define, they also reveal — by allowing different entities or spaces to communicate with each other through your buildings occupants’ perceptions. The way your boundary is handled during building design will likely determine how your occupant travels through it, their ability to create a mental map to form memories of the place, and their ability to communicate with their environment, each other, and the exterior world around them. So think of boundary as more than a line which separates two entities — also think of it as a bridge by which those two entities can interrelate. And the way you design your boundaries determine exactly how those two entities interrelate — ultimately impacting how your occupants think, feel, and behave.