Line

Each of the design elements has special expressive qualities. Line, for example, is an intuitive, primeval convention for representing things; the simple linear imagery of young children’s drawings and prehistoric rock paintings is universally understood. The formal relationships of thick with thin lines, of broken with continuous, and of sinuous with jagged are forces of contrast and repetition in the design of many paintings in all periods of history. Variations in the painted contours of images also provide a direct method of describing the volume, weight, spatial position, light, and textural characteristics of things. The finest examples of this pictorial shorthand are found in Japanese ink painting, where an expressive economy and vitality of line is closely linked to a traditional mastery of calligraphy.

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In addition to painted contours, a linear design is composed of all of the edges of tone and color masses, of the axial directions of images, and of the lines that are implied by alignments of shapes across the picture. The manner in which these various kinds of line are echoed and repeated animates the design. The artist, whether acting consciously or intuitively, also places them in relationship to one another across the picture, so that they weave a unifying rhythmic network throughout the painting.

Apart from the obvious associations of some linear patterns with particular actions—undulating lines suggesting buoyant movement, for instance—emotive sensations are produced by certain linear relationships. Thus, lines moving upward express feelings of joy and aspiration, while those directing the eye downward evoke moods of sadness or defeat.

Shape and mass

Shape and mass, as elements of design, include all areas of different color, tone, and texture, as well as individual and grouped images.

Children instinctively represent the things they see by geometrical symbols. Not only have sophisticated modern artists, such as Paul Klee and Jean Dubuffet, borrowed this untutored imagery, but the more arresting and expressive shapes and masses in most styles of painting and those to which most people intuitively respond will generally be found to have been clearly based on such archetypal forms. A square or a circle will tend to dominate a design and will therefore often be found at its focal center—the square window framing Christ in Leonardo da Vinci’s Last Supper, for example, the hovering “sun” in an Adolph Gottlieb abstract, or the halo encircling a Christian or Buddhist deity. A firmly based triangular image or group of shapes seems reassuring, even uplifting, while the precarious balance implied by an inverted triangular shape or mass produces feelings of tension. Oval, lozenge, and rectangular forms suggest stability and protection and often surround vulnerable figures in narrative paintings.

There is generally a cellular unity, or “family likeness,” between the shapes and masses in a design similar to the visual harmony of all units to the whole observed in natural forms—the gills, fins, and scales in character with the overall shape of a fish, for example.

The negative spaces between shapes and masses are also carefully considered by the artist, since they can be so adjusted as to enhance the action and character of the positive images. They can be as important to the design as time intervals in music or the voids of an architectural facade.

Color

In many styles and periods of painting, the functions of color are primarily decorative and descriptive, often serving merely to reinforce the expression of an idea or subject communicated essentially in terms of line and tone. In much of modern painting, however, the full-spectrum range of pigments available has allowed color to be the primary expressive element.

The principal dimensions of color in painting are the variables or attributes of hue, tone, and intensity. Red, yellow, and blue are the basic hues from which all others on the chromatic scale can be made by mixtures. These three opaque hues are the subtractive pigment primaries and should not be confused with the behavior of the additive triads and mixtures of transparent, colored light. Mixtures of primary pairs produce the secondary hues of orange, violet, and green. By increasing the amount of one primary in each of these mixtures, the tertiary colors of yellow-orange, orange-red, red-violet, violet-blue, blue-green, and green-yellow, respectively, are made. The primary colors, with their basic secondary and tertiary mixtures, can be usefully notated as the 12 segments of a circle, as conveniently depicted in the common color wheel. The secondary and tertiary color segments between a pair of parent primaries can then be seen to share a harmonious family relationship with one another—the yellow-orange, orange, and orange-red hues that lie between yellow and red, for example.

Local hues are the inherent and associative colors of things. In everyday life, familiar things are described by particular colors, and these often are identified by reference to familiar things; the green of grass and the grass green of paint, for instance. Although, as the Impressionists demonstrated, the inherent colors of forms in the real world are usually changed by effects of light and atmosphere, many of the early and classical styles of representational painting are expressed in terms of local hues.

Tone is a color’s relative degree, or value, of lightness or darkness. The tonal pattern of a painting is shown in a monochrome reproduction. A painting dominated by dark colors, such as a Rembrandt, is in a low tonal key, while one painted in the pale range of a late Claude Monet is said to be high keyed. The tonal range of pigments is too narrow for the painter to be able to match the brightest lights and deepest darks of nature. Therefore, in order to express effects of illumination and dense shadow, the artist must lower the overall tonal key of the design, thus intensifying the brightness value of the lightest pigment colors.

The Greco-Roman, Renaissance, and Neoclassical method of representing volume and space in painting was by a system of notated tonal values, the direction of each plane in the design being indicated by a particular degree of lightness or darkness. Each tonal value was determined by the angle at which a plane was meant to appear to turn away from an imaginary source of light. The tonal modeling, or shading, of forms was often first completed in a monochrome underpainting. This was then colored with transparent washes of local hues, a technique similar to that of color tinting a black-and-white photograph.

Each hue has an intrinsic tonal value in relation to others on the chromatic scale; orange is inherently lighter than red, for instance, and violet is darker than green. Any reversal of this natural tonal order creates a color discord. An optical shock is therefore produced when orange is juxtaposed with pink (a lighter tone of red) or pale violet is placed against dark green. Such contrasts as these are deliberately created in paintings for the purpose of achieving these dramatic and disturbing effects.

The intensity of a color is its degree of purity or hue saturation. The color of a geranium, therefore, is said to be more intense, more highly saturated with pure orange-red than is mahogany. The pigment vermilion is orange-red at maximum intensity; the brown earth pigment burnt sienna is grayer and has a lower degree of orange-red saturation.

Intense hues are termed chromatic colors. The achromatic range is made up of hues reduced in intensity by the addition of white, making the tints, or pastel colors, such as cream and pink; or of black, producing the shades, or earth colors, such as mustard and moss green; or of both white and black, creating the neutralized hues, or color-tinged grays, such as oatmeal and charcoal.

An achromatic color will seem more intense if it is surrounded by neutralized hues or juxtaposed with its complementary color. Complementaries are color opposites. The complementary color to one of the primary hues is the mixture of the other two; the complementary to red pigment, for example, is green—that is, blue mixed with yellow. The color wheel shows that the tertiaries also have their color opposites, the complementary to orange-red, for instance, being blue-green. Under clear light the complementary to any chroma, shade, or tint can be seen if one “fixates,” or stares at, one color intently for a few seconds then looks at a neutral, preferably white, surface. The color afterimage will appear to glow on the neutral surface. Mutual enhancement of color intensity results from juxtaposing a complementary pair, red becoming more intensely red, for instance, and green more fiercely green when these are contiguous than either would appear if surrounded by harmonious hues. The 19th-century physicist Michel-Eugène Chevreul referred to this mutual exaltation of opposites as the law of simultaneous contrast. Chevreul’s second law, of successive contrast, referred to the optical sensation that a complementary color halo appears gradually to surround an intense hue. This complementary glow is superimposed on surrounding weaker colors, a gray becoming greenish when juxtaposed with red, reddish in close relationship with green, yellowish against violet, and so on.

Hues containing a high proportion of blue (the violet to green range) appear cooler than those with a high content of yellow or red (the green-yellow to red-violet range). This difference in the temperature of hues in a particular painting is, of course, relative to the range and juxtaposition of colors in the design. A green will appear cool if surrounded by intense yellow, while it will seem warm against blue-green. The optical tendency for warm colors to advance before cold had been long exploited by European and Asian painters as a method of suggesting spatial depth (called atmospheric or aerial perspective). Changes in temperature and intensity can be observed in the atmospheric effects of nature, where the colors of distant forms become cooler, grayer, and bluish, while foreground planes and features appear more intense and usually warmer in color.

The apparent changes in a hue as it passes through zones of different color has enabled painters in many periods to create the illusion of having employed a wide range of pigment hues with, in fact, the use of very few. And, although painters had applied many of the optical principles of color behavior intuitively in the past, the publication of research findings by Chevreul and others stimulated the Neo-Impressionists and Post-Impressionists and the later Orphist and Op art painters to extend systematically the expressive possibilities of these principles in order to create illusions of volume and space and vibrating sensations of light and movement. Paul Cézanne, for example, demonstrated that subtle changes in the surface of a form and in its spatial relationship to others could be expressed primarily in facets of color, modulated by varying degrees of tone, intensity, and temperature and by the introduction of complementary color accents.

While the often complex religious and cultural color symbologies may be understood by very few, the emotional response to certain color combinations appears to be almost universal. Optical harmonies and discords seem to affect everyone in the same way, if in varying degrees. Thus, an image repeated in different schemes of color will express a different mood in each change.