What is mirror wisdom?

What is the right way to understand (or apply) mirror wisdom? Is it buddha-nature, bodhisattva (ripe for awakening), or both? Is it cultivated, or does it spring up naturally with enlightenment? If it's a method, how can it be utilized to curb conceit? Is it a prerequisite for non-duality? Does it have a place in mindfulness meditation? EDIT: from what i understand it's one of five wisdom types. that's about all i know. that and wondering about the people across from me on the subway, when i think maybe this is when i should work with the mirroring... https://en.wikipedia.org/wiki/Five_wisdoms