Do you know why minor design conditions matter so much? A living room arranged for constant visibility can keep attention subtly externalized. A kitchen with bright overhead lighting and crowded surfaces can force the brain to keep filtering aggressively during ordinary routines. A bedroom that also functions as a workspace blurs the cues that help the body differentiate effort from restoration. A bathroom with cold light, exposed storage, or no sense of containment can turn care into another moment of task-based vigilance. None of this has to look dramatic in order to be physiologically costly. Repetition is enough. A nervous system that repeatedly encounters interruption, sensory friction, or subtle exposure will often organize around those conditions as though they are part of what must always be anticipated.