Verses 20-21

When you see your face
in the mirror,
Do you attribute seeing
to the mirror?
Futile is such
seeing of impressions.
I am the seer, the seen
and the seeing. Distinctions
lead to impressions,
Sages have said.

When you delve deeper into perceptions, you realize that perceptions are nothing but confirmations of your impressions, which take off from the distinction of you as separate from the reality.