Om represents the three aspects of the self. The fourth aspect is represented by the silence which follows the, mmm. Silence underlies all of them and that silence represents the consciousness. In waking, waker and waker's world. In dreaming, dreamer and dream world. And in deep sleep, just for the sake of logic, sleeper and deep sleep, blankness or deep sleep world. We will investigate that. Let's not forget om. So what is om in this scheme? What is om?"