This perception of division between the seer and the object that is seen, is situated in the mind. For those remaining in the heart, the seer becomes one with the sight.
The Self alone exists. When you try to trace the ego, which is the basis of the perception of the world and everything else, you find the ego does not exist at all and neither does all this creation that you see.
Sense-perceptions can only be indirect knowledge, and not direct knowledge. Only one's own awareness is direct knowledge.