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Anna Moszynska

Term applied in its strictest sense to forms of 20th-century Western art that reject representation and have no starting- or finishing-point in nature. As distinct from processes of abstraction from nature or from objects (a recurring tendency across many cultures and periods that can be traced as far back as Palaeolithic cave painting), abstract art as a conscious aesthetic based on assumptions of self-sufficiency is a wholly modern phenomenon (see Abstraction).

In the late 19th century, and particularly in Symbolist art and literature, attention was refocused from the object to the emotions aroused in the observer in such a way that suggestion and evocation took priority over direct description and explicit analogy. In France especially this tradition contributed to the increased interest in the formal values of paintings, independent of their descriptive function, that prepared the way for abstraction. In his article ‘Définition du néo-traditionnisme’, published in L’Art et critique...

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Term applied to a drawn or painted representation of the human figure, most commonly made as part of the instruction in an academy or art school. Although the practice of making drawings from nude models had developed during the Renaissance and was commended by such theorists as Alberti, it was only with the foundation of academies of painting in the 17th century that such drawing became formalized as part of a rigorous programme of training. Indeed, by the mid-18th century, the word ‘académie’ was defined in Diderot’s Encyclopédie as ‘a public school where painters go to draw or paint, and sculptors to model, after a nude man called the model’. In France one of the principal means by which the Académie Royale de Peinture et de Sculpture asserted its predominance was by maintaining a monopoly on life classes. After the student had mastered the difficulties of copying engravings and plaster casts, he was set to draw from the nude figure under the supervision of the professor. The model was almost invariably male because female models were forbidden at the Académie Royale, and elsewhere they were extremely expensive to hire. Classes lasted two hours, and the pose was usually changed twice a week. The student began by drawing with red chalk on white paper and later progressed to black chalk on tinted papers, applying white chalk for highlights. Such drawing was an exercise in shading, hatching, graining and stumping, and increasingly the results became so homogeneous in style that unsigned examples are almost impossible to attribute. Painted academy figures (...

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Bruce Tattersall and Eva Wilson

Ornamental motif based on the leaves of the acanthus plant, an evergreen shrub native to the Mediterranean area. Two species have been proposed as likely models for different forms of decorative leaf motifs: Acanthus mollis, with broad, blunt tips to the leaves, and Acanthus spinosus, with comparatively narrow leaves and pointed lobes terminating in spines. Acanthus leaves added to a lotus and palmette border gave rise to a motif known as Anthemion. The acanthus was described by Alois Riegl as a variant of the palmette motif (for discussion and illustration see Palmette). The acanthus leaf’s spiky form and scrolling growth made it highly suitable for both ornamental and architectonic use, although, after its initial introduction in Greek art and architecture, the motif rarely corresponded closely to a particular species of plant; throughout its long history the leaf ornaments known as acanthus were imaginary designs adapted variously with no reference to any living plant. In various forms, it was one of the most widely used types of foliage motif from antiquity until the late 19th century....

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Michael Forsyth

Sound can be defined as audible vibrations within a relatively steady medium, and in buildings sound may be air-borne or structure-borne. The science of architectural acoustics is divisible into noise control and room acoustics. The following article is mainly concerned with the latter and the ‘desired’ sound generated within a space, because its design has had a significant impact on architectural form; it concentrates on examples of Western architecture.

For an extended discussion of acoustics see Grove 6.

Different acoustical conditions are preferable for listening to the spoken word as compared with different types of music. The shape, size and construction of halls and theatres—and to some extent other building types, including churches—developed historically in response to acoustical requirements. Room-acoustic design, however, is a relatively recent subject of study. Until the 20th century this relationship between acoustical requirements and the building form resulted from trial and error, involving the architect’s intuition and awareness of precedent rather than scientific knowledge. Acoustically inadequate halls were usually demolished within about 50 years, so that most surviving older halls are probably among the best that were built....

Article

Gordon Campbell

[Gr.: ‘high stone’]

Ancient Greek statue with a wooden body and the head and limbs made of stone (usually marble, sometimes limestone). This technique seems to have come into use in Greece at the end of the 6th century bc or the beginning of the 5th, and was predominantly, but not exclusively, employed for cult statues. The wooden bodies of acrolithic statues were covered in sheets of precious metal or draped with textiles regularly renewed in cult ceremonies. In ancient Greece the term acrolith (usually agalma akrolithos or xoanon akrolithos) was used relatively rarely, and is first attested in temple inventories of the 2nd century bc; Vitruvius uses it in Latin as a synonym for colossal statues. It was then reintroduced as a technical term by 18th-century antiquarians.

While the wooden bodies of ancient acroliths are not preserved, their stone extremities have occasionally survived and can be identified through specific characteristics of their technical manufacture (acrolithic heads, for example, have flat undersides, whereas heads fashioned for insertion into stone bodies were made with convex tenons). In the Hellenistic and Roman periods, the extent of stone elements can increase, so that for example the head and naked parts of the chest are made of one marble segment. The appearance of acroliths could be similar to chryselephantine (gold-ivory) statues, to which they may have offered a more cost-effective alternative, although it seems that other considerations, such as their role within the cult ritual, may have been of greater significance. Examples of surviving stone fragments from acroliths are a colossal head in the Ludovisi collection in Rome and an ...

Article

A. Delivorrias

Decorative finial crowning the apex and lower angles of the pediments of ancient Greek and Roman buildings. Acroteria were normally made of terracotta, poros, limestone or marble, although bronze acroteria are mentioned in the literary sources: Pausanias (Guide to Greece V.x.4) noted gilded Victories framed by bronze cauldrons at the lower angles of the pediments of the Temple of Zeus at Olympia. The bronze Victories framing Bellerophon and the Chimaera on the Temple of Athena Nike on the Acropolis at Athens are recorded in inscriptions, and traces of their bases survive.

The stylistic development of acroteria begins in the 7th century bc. The earliest surviving examples are the frequently enormous terracotta discs that crowned Lakonian-tiled roofs, such as that from the Temple of Hera at Olympia (Archaeol. Mus.; c. 600 bc). This type continued in the 6th century bc, and it was also sculpted in marble with relief decoration—rosettes, gorgoneia and gorgons—mainly in regions under Lakonian influence. Terracotta acroteria became highly decorative in the course of the 6th century, thanks to the potential of the more flexible Corinthian system of tiling and the advanced coroplastic tradition of the Corinthian workshops. The evolution of acroteria into increasingly sophisticated compositions based on floral, animal and mythological themes and the development of great plasticity and spectacular polychromy are recorded in a series of fragmentary examples from Greece, Magna Graecia and Sicily. Floral elements appear quite early on in variations of the palmette motif and predominate as central acroteria even after the establishment of marble as the standard sculptural material. Hybrid figures of fantastic beasts, such as sphinxes and griffins, were popular as lateral acroteria, initially in terracotta and later in marble; these did not persist after the ...

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Carmen Bria, Celia Rabinovitch and Michael Sickler

Although ‘acrylic’ has become a generic term for any synthetic paint medium, acrylics are a specific type of manmade polymer that has become standard in the commercial paint industry as well as widely used by artists from the mid-20th century; most synthetic paint media in contemporary artistic use are based on acrylic emulsions. Acrylics are thermoplastic, have great optical clarity and excellent light stability, good adhesion and elasticity and resist ultraviolet and chemical degradation. Their unique surface properties, transparency and brilliance of colour, together with the possibilities they offer for indeterminacy, immediacy, randomness and the ability to rework immediately and to achieve extremely thin or thick surfaces, are qualities that have been exploited fully by such painting movements as Abstract Expressionism in the 1950s, and, subsequently, colour field painting, hard-edge painting and Pop art.

See also Paint, §I; Polymer colour; and Plastic, §2, (ii).

Acrylics were first prepared in ...

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C. V. Horie and Eddy de Witte

Substances used to bond two surfaces. The surfaces may consist of the same material, as when mending a broken object, or of different materials, for example a collage. When applied to pigments the adhesive is called a Fixative, when applied to a crumbling solid a Consolidant.

The earliest adhesives used in the making of works of art and decorative objects were such natural products as proteins, resins, juices of plants, waxes and fats. In the 20th century the development of synthetic polymer adhesives has made it possible to join any two materials.

‘Glue’ is a general term for adhesives based on gelatine, that is degraded collagen (the major connective protein in animals). Skin and bone waste products are the most generally used source of collagen but yield contaminated products, for example glue made from tannery waste is likely to contain both metal and organic tanning agents and be of low quality. Purer forms of collagen provide better products, for example the swim-bladders of fish, especially sturgeon, yield isinglass, while parchment yields parchment glue. The glue is made by slow cooking of the source-material in water, then clarifying the resulting solution and concentrating or drying the gelatine. Mammal-derived glues are soluble only in hot water, while fish glues dissolve to form liquids at room temperature. Skin glues tend to be stronger than other types. Terms such as ‘rabbit-skin glue’ (Europe) and ‘deer-skin glue’ (Japan) do not now define the source-material but indicate the grade. ...