Hypaethral - Without a roof, open to the sky. Temple of Phidae Hyperbolic paraboloid roof - A special form of double-curved shell, the geometry of which is generated by straight lines. This property makes it fairly easy to construct.
hypaethral: (Greek) open to the sky. imperial staircase: one with a central arm breaking into 2 flights which follow the outer walls. impluvium: (Roman) water tank housed in central hall or atrium provided with an opening in the roof.
Cleithral - term applied to a covered Greek temple, in contradistinction to hypaethral, which designates one that is uncovered; the roof of a cleithral temple completely covers it. Chisholm, Hugh, ed (1911). "Cleithral".
in diameter; the rain therefore fell in at times, and consequently the pavement had a convex contour, there being also holes under the hypaethral opening in connexion with drains beneath the pavement.
See also: Roman, House, Architecture, Temple, Greek
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