Of recent years,hyperbolic paraboloid doubly curved surface, has been used extensively in construction. It makes efficient ur.e of materials by relying on form or shape for strength rather than on mass. The simplicity of its structural action and its inherent beauty make it possible to achieve aesthetically pleasing structures of imposing proportions. One of the features of the hyperbolic paraboloid form, which appeals to the architect, is the many ways in which this warped surface can be combined to achieve completely dissimilar striking effects. The groined vault, the inverted umbrella and the saddle shape vault are all popular examples of the different appearances which can be achieved with basically the same
