Philosophically, the Smarta tradition emphasizes that all idols (murti) are icons to help focus on and visualize aspects of Brahman, rather than distinct beings. The ultimate goal in this practice is to transition past the use of icons, recognize the Absolute symbolized by the icons, on the path to realizing the nondual identity of one's Atman (soul, self) and the Brahman. Popularized by Adi Shankara, many Panchayatana mandalas and temples have been uncovered that are from the Gupta Empire period, and one Panchayatana set from the village of Nand (about 24 kilometers from Ajmer) has been dated to belong to the Kushan Empire era (pre-300 CE). The Kushan period set includes Shiva, Vishnu, Surya, Brahma and one deity whose identity is unclear.