Their culture believed that an individual person was in fact a community of individuals, each with their own voice, their own desire and their own view of the world. This belief was manifested in one of their forms of art known as a Kurlan naiskos.
The Kurlan history can be divided into several ages, among them the Third Dynasty (about 12,000 years ago) and the Fifth Dynasty. The Kurlans died out several millenia before the 24th century. (TNG: "The Chase")