There are two ways of using situations and other people as mirrors.
What do I see out there? How would I describe it? Where do I find it in myself?
What does that situation say about me? What does it bring up in me?
For instance, I see someone as fearful and demanding. Can I find that in myself? Can I meet those parts of me with love?
And, I see someone as fearful and demanding. What does it say about me?
The first one is the typical “world as mirror” approach. The second is used in the Living Inquiries. And both can be very helpful.