Zīlū seems to be a term of Persian origin. It refers to a type of reversible cotton floor “spread”, generally either blue and white or light brown and white in colour, which is decorated with stylized geometrical motifs and patterns. The blue cotton yarns in Zīlū are the same as those used in weaving palās, or denim cloth; the white yarns are undyed cotton (fig. 1).
Zīlū were the traditional floorcoverings in most mosques in the south, central and Khurasan regions of Iran, that is, in the country's drier areas; because the yarns used in their construction deteriorate in cold, damp environments, a/a are uncommon in otherparts of Iran. Zīlū were woven to fit the shabistān and the atvān of mosques. The names of patrons and craftsmen were customarily woven into those Zīlū presented as vaqfvo mosques and other religious institutions (figs. 2 - 3).