Virat is the Vishwa group which are Juna experience in the 11th chapter of the Gita, one consciousness pervading the entire universe all appearing together. You see that there because this is not something we have experienced. So what is that consciousness? That consciousness should be available to us here, here and here.
Swami Sarvapriyananda teaches one of the shortest and most profound upanishads accompanied by Gaudapada's Karika. This lecture covers Karika 1-5.