But in quantum mechanics, boundary conditions are more likely to be part of the solution than the problem. The solution to the Schrödinger equation for a particle trapped in a square well emerges from recognizing that at the boundaries, the wave function must be zero. Boundary conditions clarify, they sharpen.
I've been thinking about boundaries in my own life. There is the new door to my study, which no longer requires that I shove a pile of heavy chemistry texts against the door to keep the cat out. It allows easier access (and egress -- I no longer have to interrupt what I was doing in order to blockade the door again) to my guys, but makes it impossible for the cat and much of the household noise to get in.
Good boundaries are to some extent permeable. The monastic enclosure at New Camaldoli keeps out clueless tourists and wandering retreatants, but lets God and a view of the Pacific in. My challenges at the moment are less boundaries in space than boundaries in time. How I can plant a sign for a monastic enclosure in time, rather than in space?