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Dimensions. 27.5 cm × 33.5 cm (10.8 in × 13.2 in) 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. The relative aspects of the objects in the image are distorted in such a way that many of the ...
The Hollow-Face illusion (also known as Hollow-Mask illusion) is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face. While a convex face will appear to look in a single direction, and the gaze of a flat face, such as the Lord Kitchener Wants You poster, can appear to track a moving viewer, a ...
Illusionistic ceiling painting. The illusionistic perspective of Andrea Pozzo 's trompe-l'œil dome at Sant'Ignazio (1685) creates an illusion of an actual architectural space on what is, in actuality, a slightly concave painted surface. Illusionistic ceiling painting, which includes the techniques of perspective di sotto in sù and quadratura ...
The Hockney–Falco thesis is a controversial theory of art history, proposed by artist David Hockney in 1999 and further advanced with physicist Charles M. Falco since 2000 (together as well as individually). They argued that advances in naturalism and accuracy in the history of Western art since the early Renaissance (circa 1420/1430) were ...
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 curved mirror is a mirror with a curved reflecting surface. The surface may be either convex (bulging outward) or concave (recessed inward). Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices. The most common non-spherical type are parabolic reflectors, found in ...
Polygon. Some polygons of different kinds: open (excluding its boundary), boundary only (excluding interior), closed (including both boundary and interior), and self-intersecting. In geometry, a polygon (/ ˈpɒlɪɡɒn /) is a plane figure made up of line segments connected to form a closed polygonal chain. The segments of a closed polygonal ...
Molding (decorative) Moulding (British English), or molding (American English), also coving (in United Kingdom, Australia), is a strip of material with various profiles used to cover transitions between surfaces or for decoration. It is traditionally made from solid milled wood or plaster, but may be of plastic or reformed wood.