Various types of interlacing lozenge-like motifs are heavily featured on the surface of minarets starting in the Almohad period (12th-13th centuries) and are later found in other decoration such as carved stucco along walls in Marinid (and Nasrid) architecture, eventually becoming a standard feature in the Moroccan ornamental repertoire in combination with arabesques. This motif, typically called "sebka" (meaning "net"), is believed by some scholars to have originated with the large interlacing arches in the 10th-century extension of the Great Mosque of Cordoba by Caliph al-Hakam II. It was then miniaturized and widened into a repeating net-like pattern that can cover surfaces. This motif, in turn, had many detailed variations. One common version, called "darj wa ktaf" ("step and shoulder") by Moroccan craftsmen, makes use of alternating straight and curved lines which cross each other on their symmetrical axes, forming a motif that looks roughly like a fleur-de-lys or palmette shape. Another version, also commonly found on minarets in alternation with the "darj wa ktaf", consists of interlacing multifoil/polylobed arches which form a repeating partial trefoil shape.