The evil eye is a supernatural belief in a curse brought about by a malevolent glare, usually given to a person when one is unaware. The evil eye dates back about 5,000 years. In the 6th century BC it appeared on Chalcidian drinking vessels, known as 'eye-cups', as a type of apotropaic magic. It is found in many cultures in the Mediterranean region as well as Western Asia and Central Asia with such cultures often believing that receiving the evil eye will cause misfortune or injury, while others believe it to be a kind of supernatural force that casts or reflects a malevolent gaze back upon those who wish harm upon others. Older iterations of the symbol were often made of ceramic or clay; however, following the production of glass beads in the Mediterranean region in approximately 1500 BC, evil eye beads were popularised with the Phoenicians, Persians, Greeks, Romans and Ottomans.