ajour

thumb|Openwork basket, English Bow porcelain, c. 1754–1755 right|thumb|alt=A gold bracelet with a pattern and writing created by making holes in the bracelet|Ancient Roman gold bracelet from the Hoxne Hoard. JULIANE is spelled out in [[opus interrasile openwork.]] thumb|Intricate jalis from the [[Sidi Saiyyed mosque in Ahmedabad, India. From the inside]]

In art history, architecture, and related fields, openwork or open-work is any decorative technique that creates holes, piercings, or gaps through a solid material such as metal, wood, stone, pottery, cloth, leather, or ivory. Such techniques have been very widely used in a great number of cultures.