The semi-square is half a square, forty-five degrees, and it behaves like one at lower volume. It produces minor but persistent friction between two planetary functions: not a crisis, more an irritation, a grain of sand in the shoe of that part of life. The discomfort is just enough to keep the issue from being ignored. Semi-squares show where you experience low-level impatience, recurring minor obstacles, and a nagging sense that something needs fixing. Their value is mobilizing. People rarely coast through their semi-squares; the itch keeps them adjusting, deciding, and pushing through small obstacles that would stall someone without the irritation to answer them.