Mudéjar architecture, the design elements used in the Iberian Peninsula by Muslim craftsmen living under Christian rule and working for Christian and also for Jewish patrons, shares considerable formal features with the architecture of the Muslim West. It is primarily an architecture where brick is used for both structural and decorative purposes. It incorporates features such as the horseshoe arch, Arabic inscriptions, as well as muqarnas and interlaced decorative patterns, all combined with European Romanesque, Gothic, and Renaissance elements.