Why this shape and not that? Why steel instead of concrete or stone? Why put it here and not over there? In Building Big, the companion book to the 5-part public television series, David Macaulay gets readers thinking about structures they see and use every day-bridges, tunnels, skyscrapers, domes, and dams. Whether a structure is imposing or inspiring, he shows us that common sense and logic play just as important a part in architecture as do imagination and technology. As always, the Caldecott Medal-winning author inspires readers of all ages to look at their world in a new way.