I never heard of true mirrors until recently.  I find this video fascinating but hard to follow!        It's from a science blog called Physics Girl.       Here's the link:   Physics Girl     Another video from YouTube:            I copied the instructions on how to make your own mirror:       I haven't tried to make one myself yet.     Broken glass from dropping the mirrors can be dangerous.   A homemade mirror will show a line down the center where the two mirrors touch.  For a perfect model I saw them selling for over $200! So much money for two mirrors attached together!  
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