Center around semicircular motifs usually repeated four times around vessel. Each unit may consist of several concentric semicircles, all plain lines, plain lines alternating with ticked lines, narrow bands with large spurs jutting from one edge, cross hatched bands with spurs, and various combinations. A common dividing element between these units consists of two vertical lines between which a reversed S-shaped line is drawn, with short lines pointing toward its ends from the flanking lines. Straight lines and stepfrets may be combined with curved lines. Spirals, whorls, scrolls, circles, and negative disks outlined by crosshatched areas are all combined in a wide variety of pleasing designs. Rims of compound bowls usually bear simple horizontal lines widely spaced but may be plain or more elaborately decorated. The very deep bowls may have rim designs like those described or completely angular motifs repeated many times around vessel; these are regarded as a distinct variety within the type. Red pigment may occasionally appear in lines of dark vessels, and in at least one case, white pigment provides contrast on a red-filmed vessel. Usually, however, the red film provides a strong contrast with the light buff-colored clay exposed by engraving.