Everything that anyone has ever written a book about is also a non-linear network of interactions. Consider a textbook in any field. Physics is not a linear thi

Everything that anyone has ever written a book about is also a non-linear network of interactions. Consider a textbook in any field. Physics is not a linear thing. Economics is not a linear thing. Even the thing a novel describes is not linear: characters are not linear, the world is not linear. You can linearize a program randomly, alphabetically, chronologically, or more usefully by order of module dependency.