What prehistoric artefact is found in every classroom? What is the oldest scientific instrument? Why does geometry mean `earth measure'? What does perspective drawing have in common with the Great Pyramid? In this ground-breaking little book, artist Adam Tetlow introduces the ancient harmonic number science of metrology, used since palaeolithic times to determine musical scales, and measure, design and build stone circles, earthworks, temples, churches and cities all over the world. WOODEN BOOKS are small but packed with information. "Fascinating" FINANCIAL TIMES. "Beautiful" LONDON REVIEW OF BOOKS. "Rich and Artful" THE LANCET. "Genuinely mind-expanding" FORTEAN TIMES. "Excellent" NEW SCIENTIST. "Stunning" NEW YORK TIMES. Small books, big ideas.