Vijnanamaya kosha
Vigyanamaya kosha is one of the five koshas that cover Atman. Vigyanamaya kosha literally means a shell that is composed of wisdom (vijnana) or intellect. It is the fourth covering of Atma. It is also the first layer of the causal mind located in the Vishudda chakra, the Ajna chakra and the Sahasrara chakra. Metaphysically, it is considered the first embodiment of light.