Compounding is the principle that small things, applied to themselves, become large things. It is the math of accumulation. Each unit of growth is added to a base that the previous unit already enlarged, so the growth itself grows. A penny that doubles each day is not adding pennies. It is multiplying against everything it has already become. This is why compounding looks like nothing in the early days and looks like a miracle in the late ones. Nothing is happening. And then, suddenly, everything is.