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Convex and Concave is a lithograph print by the Dutch artist M. C. Escher, first printed in March 1955. [ 1 ] It depicts an ornate architectural structure with many stairs, pillars and other shapes.
Alternating convex and concave flutes on the two nearest piers. In Byzantine architecture columns were mostly relatively small and functional rather than decorative. They were used to support galleries, ciboriums over altars and the like. Byzantine taste appreciated rare and expensive types of stone, and like to see these in round and polished ...
A building's surface detailing, inside and outside, often includes decorative moulding, and these often contain ogee-shaped profiles—consisting (from low to high) of a concave arc flowing into a convex arc, with vertical ends; if the lower curve is convex and higher one concave, this is known as a Roman ogee, although frequently the terms are used interchangeably and for a variety of other ...
Other varieties of concave moulding are the scotia and congé and other convex mouldings the echinus, the torus and the astragal. Placing an ovolo directly above a cavetto forms a smooth s-shaped curve with vertical ends that is called an ogee or cyma reversa moulding. Its shadow appears as a band light at the top and bottom but dark in the ...
Depending on the movement around the sculpture and effects of lighting, concave and convex surfaces appear alternately to protrude or recede. His use of sculptural voids was inspired by the philosopher Henri Bergson 's Creative Evolution (1907) on the distortions of our understanding of reality, and how our intellect tends to define ...
A rectilinear polygon has corners of two types: corners in which the smaller angle (90°) is interior to the polygon are called convex and corners in which the larger angle (270°) is interior are called concave. [1] A knob is an edge whose two endpoints are convex corners. An antiknob is an edge whose two endpoints are concave corners. [1]
A cavetto is a concave moulding with a regular curved profile that is part of a circle, widely used in architecture as well as furniture, picture frames, metalwork and other decorative arts. In describing vessels and similar shapes in pottery, metalwork and related fields, "cavetto" may be used of a variety of concave curves running round objects.
In 1817 Carl Friedrich Gauss improved the Fraunhofer telescope objective by adding a meniscus lens to its single convex and concave lens design. Alvan Clark further refined the design in 1888 by taking two of these lenses and placing them back to back. The lens was named in honour of Gauss.