There is a misconception of the information regarding the concept of mirrors. Yes all you see and perceive in and as your reality is deriving from you as you are the Observer or what is occuring. To use this as an image that needs to be interpreted and mixed into the pot of judgements about how you should be as a “spiritually evolved” person adds to the stress and the locking up of energies.
Yes to see yourself in others. To see and recognise that we are all part of the same Source. Yes you are the observer but you neeed to not see foremost what the other person is seemingly doing but to what that awakens in you. What it awakens gifts you the Knowing of you.
And as there is nothing judgable about you – no right or wrong – just the occurance and awakening of emotional patterns in your Being you can look at it all and go OK this is occuring in me when someone that I have created as a mirror in my life is acting a certain way.

There is a distincion to looking within and then there is the illusion of looking without. If you end up looking for all to be your mirror then what are you looking for? Definitions? Definitions of yourself? Or yet another gift showing you that you are not different than any other species on Earth because you can experience everything in the present moment.
If you are using your experienced reality as a mirror you must always be searching for what you perceive to be either right about you or wrong about you. This keeps you in your head and your mind owns you. You may also find that you are avoiding certain experiences because you have in forehand decided the reaction that will arise in you. This you call consequences. When in reality you have the ability to shift and change everything. There is no cause and affect as long as you are always present in the Now as it presents itself.