""The Theory of Proportion"" is a book written by M.J.M. Hill in 1914. The book is an in-depth exploration of the mathematical concept of proportion, covering both its historical development and its modern applications. The author begins by tracing the origins of proportion in ancient Greece, where it was first studied by mathematicians such as Pythagoras and Euclid. From there, he explores the various ways in which proportion has been used throughout...