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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 ...
Convex and strictly convex grid drawings of the same graph. In graph drawing, a convex drawing of a planar graph is a drawing that represents the vertices of the graph as points in the Euclidean plane and the edges as straight line segments, in such a way that all of the faces of the drawing (including the outer face) have a convex boundary.
Convex fluting was probably intended to imitate plant forms. [2] Minoan and Mycenaean architecture used both, but Greek and Roman architecture used the concave style almost exclusively. [3] Fluting was very common in formal ancient Greek architecture, and compulsory in the Greek Doric order. It was optional for the Ionic and Corinthian orders ...
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 ...
The ovolo or echinus is a convex decorative molding profile used in architectural ornamentation. Its profile is a quarter to a half of a more or less flattened circle. The 1911 edition of Encyclopædia Britannica says: adapted from Ital. uovolo, diminutive of uovo, an egg; other foreign equivalents are Fr. ove, échine, quart de rond; Lat ...
Drawing Hands is a lithograph by the Dutch artist M. C. Escher first printed in January 1948. It depicts a sheet of paper, out of which two hands rise, in the paradoxical act of drawing one another into existence. This is one of the most obvious examples of Escher's common use of paradox.
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.
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 ...