Even today, watchmakers approach this area of watchmaking with few illusions as to the magnitude of the challenge. Building a Grande Complication wristwatch confronts them with a maze of technical difficulties challenging both their skill and their powers of invention. Thinking and working in four dimensions, generations of Breguet watchmakers have driven their art to new heights turning out minute repeaters, perpetual calendar watches and tourbillon designs. Two patent, for instance, protect Breguet's most recent developments in perpetual calendar design.