'That Brahman,' O Gargi, 'is unseen, but seeing; unheard, but hearing; unperceived, but perceiving; unknown, but knowing. There is nothing that sees but it, nothing that hears but it, nothing that perceives but it, nothing that knows but it. In that Akshara then, O Gargi, the ether is woven, like warp and woof.'

In plain words: Yagnavalkya says Brahman cannot be seen, heard or known, yet it is what sees, hears and knows. Nothing else truly sees or knows except it. Space itself is woven into this Imperishable.