Pair of Doors (left door), early 1400s. Typical of Muslim-inspired ornamentation, these doors reflect a love of geometric decoration stemming from a non-realistic artistic tradition. They consist of applied wood strips that form eight-point stars, flowers, and geometric interlace designs. Such designs are reflected in the tiles, ceramic vessels, and metalwork of Muslim-occupied Spain. The origin of the doors is not known, but they may have belonged to a palace or domestic residence. In 711, the Moors had invaded and conquered nearly the entire peninsula. During the next 750 years, independent Muslim states were established, and the entire area of Muslim control became known as Al-Andalus. Muslim philosophers and scientists developed knowledge in areas like medicine, optics, algebra, chemistry, and geometry, as seen here. Typical of Muslim-inspired ornamentation, these doors reflect a love of geometric decoration stemming from a non-realistic artistic tradition. They consist of applied wood strips that form eight-point stars, flowers, and geometric interlace designs. Such designs are reflected in the tiles, ceramic vessels, and metalwork of Muslim-occupied Spain. The origin of the doors is not known, but they may have belonged to a palace or domestic residence.