Hagia Sophia's dome floats on invisible triangles
The Hagia Sophia's 6th-century dome pioneered 'pendentives,' triangular supports that made its massive structure appear to float, revolutionizing architectural design for centuries.
The Hagia Sophia, built in the 6th century, revolutionized architecture with its massive dome. Architects Isidore of Miletus and Anthemius of Tralles solved the challenge of placing a round dome on a square building using 'pendentives.' These triangular, curved segments smoothly transition from the square base to the dome's circular rim. This ingenious solution allowed for larger, more stable domes without heavy supports, making the 55-meter-high dome appear to float. Its design, enhanced by 40 windows, inspired structures for centuries, from Jerusalem's Dome of the Rock to European Renaissance designs.