Even if it just switched the mirror between reflecting and not, I think it would be cool. The real game-changer with visible light metamaterials is negative in

Even if it just switched the mirror between reflecting and not, I think it would be cool. The real game-changer with visible light metamaterials is negative index of refaction, which will allow for completely flat optical lenses. Light-weight and low distortion. Hopefully coming to VR headsets in my lifetime.