A magic square is an arrangement of numbers where the rows, columns, and two main diagonals add up to the same number. One of the most important squares, the Luoshu, has been studied and revered for its magical properties for centuries. Even today, the Luoshu is key to feng shui, cosmology, the occult, numerology, and mathematical puzzles. Professor Swetz explores its historical and present-day uses. "...a convincing account of magic squares in traditional Chinese society,...their relevance to music, architecture, and even martial arts." -- Paul R. Goldin, author "An engaging and informative history of the magic square. A must for anyone who loves numbers." -- Ian Stewart, author