Later Blavatsky proclaimed the septenary of Man and Universe. One variant uses tridecimal months, quaternary weeks, and septenary days. The text is written in hendecasyllabic and septenary verses; it is divided into five acts. The Septenary in Helena Blavatsky's teachings refers to the seven principles of man. The Indian Theosophist T. Subba Row correlated the five koshas with Blavatsky's septenary principle. Septenary systems are very rare, as few natural objects consistently have seven distinctive features.