pendentives

Pendentives are architectural features used to transition from a square or polygonal space below to a circular or domed space above. Imagine placing a three-dimensional "curved triangle" at each corner of a square room, which smoothly directs the weight and shape of a large dome evenly onto the supporting pillars or walls below. This structure distributes the dome's weight in a stable way, enabling builders to create impressive domed ceilings over square or rectangular rooms. Pendentives are essential in many historic domed buildings, allowing for beautiful, open interior spaces with large circular domes.