A catenary vault is an architectural structure formed by the curve of a catenary, which is the shape a hanging chain or cable takes under its own weight. This type of vault is often used in the design of ceilings and roofs, providing both aesthetic appeal and structural stability. The curve distributes weight evenly, allowing for larger spans without the need for additional support. Catenary vaults are commonly found in historical and modern buildings, including those designed by famous architects like Antoni Gaudí. They are particularly effective in creating open spaces, as they can support significant loads while maintaining a graceful, flowing form.