This Youtube video shows what a "true mirror" is: https://www.youtube.com/watch?v=ZSxCZCy5Wsk
In short, when you look into a true mirror you look at yourself (among other things) as you really are, instead of as a mirror image. That is what looking at real time video recording feels like.
But as anyone ever tried shaving or doing their makeup using a live video can tell, a true mirror makes you clumsy, to say the least. From my own experience, I find myself constantly confuse both left-right and front-back in such a case, which is interesting because a true image is just a mirror image that reverses left-right and front-back. So it seems to me some part of my brain in some sense recognizes my true image as a mirror image, and summons whatever pertinent mirror image circuits to automatically take on from there. Any other thoughts on how to explain this difficulty?
Think about this: suppose a person grows up never seeing a mirror reflection, will he be able to use a mirror for the first time? will he not be better off with a "true mirror" than with a mirror? If he grows up using true mirrors, will he be as clumsy with mirrors as we are with true mirrors? We feel natural and at ease dealing with mirror images. Is this just the result of practice and experience? I'm curious if a true mirror will become as natural as a mirror if one uses it for long enough.