11. The hyperbolic paraboloid is a doubly ruled surface : it contains two families of mutually skew lines. 12. Other interesting structures that he designed included the shells ( hyperbolic paraboloid ) for the Cairo International Fair. 13. According to a contemporary publication, " the construction of the twin hyperbolic paraboloid main roofs is unique ". 14. The market is especially noteworthy for its roof of hyperbolic paraboloids , which allow for wide areas without supports. 15. The Catalano House was sometimes referred to as the " Potato Chip " house because of the swooping hyperbolic paraboloid roof. 16. The building is seven storeys high and its hyperbolic paraboloid frame continues on the exterior, hence the toast rack comparison. 17. Constructed on a hillside, the Sky House is a platform supported on four concrete panels with a hyperbolic paraboloid shell roof. 18. The Catalano House, built in 1954 and which Catalano is best known for, was designed using a hyperbolic paraboloid roof. 19. The roof of the house is shaped like a hyperbolic paraboloid , and is constructed using teak rafters and lined with yellowwood. 20. The three-bedroom house featured a roof which was a hyperbolic paraboloid , built of wood 2.5 " thick.
