The concept of the avatars of Vishnu seems to have formed during the Kushan period in the 3rd to 2nd century CE. Some sculptures during this period suggest that the "Vyūha doctrine" "(Vyūhavāda", "Doctrine of the emanations") was starting to emerge, as images of ""Chatur-vyūha"" (the "four emanations of Vāsudeva") are appearing. The famous "Caturvyūha" statue in Mathura Museum is an attempt to show in one composition Vāsudeva as the central deity together with the other members of the Vrishni clan of the Pancharatra system emanating from him: Samkarsana, Pradyumna and Aniruddha, with Samba missing. The back of the relief is carved with the branches of a Kadamba tree, symbolically showing the genealogical relationship being the different deities. The depiction of Vāsudeva and later Vishnu was stylistically derived from the type of the ornate Bodhisattvas, with rich jewelry and ornate headdress.