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Fine or microscopic spiral sculpture (also called "striae") is present in many species. The shells sometimes feature an umbilicus . Wentletrap shells have a roundish or oval aperture , but its inner lip is often reduced to strip of callus.
Trellis in the courtyard of the Wernberg monastery, Wernberg, Carinthia, Austria A trellis (treillage) is an architectural structure, usually made from an open framework or lattice of interwoven or intersecting pieces of wood, bamboo or metal that is normally made to support and display climbing plants, especially shrubs.
Spiral columns are cylindrical columns with a continuous helical bar wrapping around the column. The spiral acts to provide support in the transverse direction and prevent the column from barreling. The amount of reinforcement is required to provide additional load-carrying capacity greater than or equal to that attributed from the shell as to ...
Roman guilloche around a scene with Diana the Huntress, late 2nd century AD, mosaic, Bardo National Museum, Tunis, Tunisia [1]. Guilloché (French:), or guilloche (/ É¡ ɪ ˈ l oÊŠ ʃ /), is a decorative technique in which a very precise, intricate and repetitive pattern is mechanically engraved into an underlying material via engine turning, which uses a machine of the same name.
The spiral stair is a type of stairway which, due to its complex helical structure, has been introduced relatively late into architecture. Although the oldest example dates back to the 5th century BC, [ 1 ] it was only in the wake of the influential design of the Trajan's Column that this space-saving new type permanently caught hold in ancient ...
For <, spiral-ring pattern; =, regular spiral; >, loose spiral. R is the distance of spiral starting point (0, R) to the center. R is the distance of spiral starting point (0, R) to the center. The calculated x and y have to be rotated backward by ( − θ {\displaystyle -\theta } ) for plotting.
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