We are fundamentally spiritual beings covered in sheaths of various densities! These coverings or aspects of our being are called koshas, and this kosha model of the human personality provides a roadmap for working with ourselves at every level through yoga. Moving from outer to inner and grossest to most subtle, the five koshas are the physical or food covering, the covering made of living energy (prana), the mind or mental covering, the ability to discriminate, and the covering made of bliss, which is very close to our pure being (atman).