The Sydney opera house in Australia owes a stylistic debt to the architecture of John Utzon. This was one of the well-known modern design architectures in the world. It is recognized for its geometrical structure, made largely of concrete shells.
Hyperbolic plane geometry is also the geometry of saddle surfaces and pseudospherical surfaces, surfaces with a constant negative Gaussian curvature. A modern use of hyperbolic geometry is in the theory of special relativity, particularly Minkowski spacetime and gyrovector space.
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