This is probably a small array of double mirror. If you look at the images you see slight loss of light (a bit darker) on his none-reversing mirror. Which is probably due to the gaps between the arrays behaving a bit like a scrim in shooting sets.

I think the invention will have some uses. For anyone who has tried to do anything that requires precision in front a mirror the reversing of the mirror is disorienting. I could even imagine mechanics who use a mirror to see what they are doing in tight spots be able to use it to coordinate their motion to put the ranch on the right nut when they are using a mirror.