Why the Special Interest in Mirror?

Someone wrote,

"Dependent Origination only applies to the reflections, but not to the mirror. The reflections are dependent upon the mirror. The mirror is not dependent upon anything."

Thusness replied,

"When mundane reflections are realized to be always free from extremes and non-arisen,
Why the special interest in mirror?

Dependent arising is taught so that the nature of phenomena can be realized to no different from nirvana. Whatever arises in dependence is empty and non-arisen.

Where then is the need for movement and preference from here to there, from reflections to mirror?

And how is even movement possible?

Confusion is the only movement. Ultimately nothing ever arose.

Gassho and good luck!"