The name of the fourth head as Kapila is interpreted in two ways. Taking the literal meaning of kapila as red, it is interpreted as meaning fierce or angry. The epithet kapila is associated with the fire god Agni and the solar deity Surya in early canonical texts. Another theory relates to Vishnu's sage avatar and founder of Samkhya philosophy, Kapila, who is described as having a wrathful nature and cursing the sons of Sagara to turn into ashes for insulting him. The head-dress jatajuta is typical of Brahmin sages like Kapila. The Agni Purana also describes the icon having four heads, without describing the nature of each. The iconographical treatises Aparajitapriccha and the Rupamandana mention that the fourth head is Shri (Lakshmi - the wife of Vishnu) and Stri (female) respectively, however no sculptures with a fourth female head have been discovered. The back face may be carved on the halo behind the central three heads in low relief or in a space between the halo.