This Purusha has Thousand heads, Thousand eyes and Thousand feet. Purusha pervades the whole universe and yet is beyond it also. Whatever was, is and will be is Purusha alone. Creation is an illusion and an appearance of Purusha. This illusion is playing continuously in 1 quarter of the Purusha as though. The rest of the 3 quarters are unaffected. Like the mirage in the desert appears only in one small portion.