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This piece once hung with a lamp, possibly in either the mosque or mausoleum (tomb) of Sultan Selim I (d. 1517) in Istanbul. The inscription around the body of the sphere is a hadith, or saying attributed to the Prophet Muhammad: “The world is only one hour, so hasten to prayer before dying and hasten to repent before death.”Islamic religious buildings traditionally were lit with glass lamps, generally called mosque lamps, that hung from chains. In 16th-century Turkey, it was common to make mosque lamps from glazed ceramic and to pair them with round or oval ornaments. Such ceramic pieces were of little use as lighting fixtures. They may have functioned, however, as acoustic devices, hung in groups to soften the echo of voices in the prayer hall. Mosque lamps were also symbols of divine light, and, therefore, of God's presence in the place of prayer, while the ornamental spheres symbolized the orb of heaven.