There are some seriously beautiful installations out there that feature mirrors. Check out these “mindmelting” amazing mirrors in art. These images are not to be missed!!
http://www.buzzfeed.com/kevintang/mind-melting-artworks-made-with-mirrors#t7qhwl
http://beautifuldecay.com/2013/11/29/dan-graham-four-artists-use-mirrors-artwork/
Daniel Rozen, mirror artist
http://www.smoothware.com/danny/
Mirror Cubes
http://twistedsifter.com/2013/12/light-bending-cube-of-one-way-mirrors-numen-for-use/
Here also is a fabulous blog post, How Mirrors Changed Art, from Thinking About Art that talks about some of the earliest mirrors and includes links to some interesting videos as well as some additional resources (though some of the links no longer function).