The creative arts are often divided into more specific categories, each related to its technique, or medium, such as decorative arts, plastic arts, performing arts, or literature. Unlike scientific fields, art is one of the few subjects that are academically organized according to technique [2]. An artistic medium is the substance or material the artistic work is made from, and may also refer to the technique used. For example, paint is a medium used in painting, and paper is a medium used in drawing.

An art form is the specific shape, or quality an artistic expression takes. The media used often influence the form. For example, the form of a sculpture must exist in space in three dimensions, and respond to gravity. The constraints and limitations of a particular medium are thus called its formal qualities. To give another example, the formal qualities of painting are the canvas texture, color, and brush texture. The formal qualities of video games are non-linearity, interactivity and virtual presence. The form of a particular work of art is determined by the formal qualities of the media, and is not related to the intentions of the artist or the reactions of the audience in any way what so ever.

A genre is a set of conventions and styles within a particular medium. For instance, well recognized genres in film are western, horror and romantic comedy. Genres in music include death metal and trip hop. Genres in painting include still life and pastoral landscape. A particular work of art may bend or combine genres but each genre has a recognizable group of conventions, clichés and tropes. (One note: the word genre has a second older meaning within painting; genre painting was a phrase used in the 17th to 19th centuries to refer specifically to paintings of scenes of everyday life and can still be used in this way.)

The Great Wave off Kanagawa by Hokusai (Japanese, 1760–1849), colored woodcut print

R. Gopakumar: Cognition-Libido (Digital Print on Canvas, Limited Edition, 1/7). In the permanent collection of the Kinsey Institute for Research in Sex, Gender, and Reproduction

The style of an artwork, artist, or movement is the distinctive method and form followed by the respective art. Any loose brushy, dripped or poured abstract painting is called expressionistic. Often a style is linked with a particular historical period, set of ideas, and particular artistic movement. So Jackson Pollock is called an Abstract Expressionist.

Because a particular style may have specific cultural meanings, it is important to be sensitive to differences in technique. Roy Lichtenstein's (1923–1997) paintings are not pointillist, despite his uses of dots, because they are not aligned with the original proponents of Pointillism. Lichtenstein used Ben-Day dots: they are evenly spaced and create flat areas of color. Dots of this type, used in halftone printing, were originally used in comic strips and newspapers to reproduce color. Lichtenstein thus uses the dots as a style to question the "high" art of painting with the "low" art of comics – to comment on class distinctions in culture. Lichtenstein is thus associated with the American Pop art movement (1960s). Pointillism is a technique in late Impressionism (1880s), developed especially by the artist Georges Seurat, that employs dots that are spaced in a way to create variation in color and depth in an attempt to paint images that were closer to the way people really see color. Both artists use dots, but the particular style and technique relate to the artistic movement adopted by each artist.

These are all ways of beginning to define a work of art, to narrow it down. "Imagine you are an art critic whose mission is to compare the meanings you find in a wide range of individual artworks. How would you proceed with your task? One way to begin is to examine the materials each artist selected in making an object, image video, or event. The decision to cast a sculpture in bronze, for instance, inevitably effects its meaning; the work becomes something different from how it might be if it had been cast in gold or plastic or chocolate, even if everything else about the artwork remains the same. Next, you might examine how the materials in each artwork have become an arrangement of shapes, colors, textures, and lines. These, in turn, are organized into various patterns and compositional structures. In your interpretation, you would comment on how salient features of the form contribute to the overall meaning of the finished artwork. [But in the end] the meaning of most artworks... is not exhausted by a discussion of materials, techniques, and form. Most interpretations also include a discussion of the ideas and feelings the artwork engenders."^[16]