Windows' new HoLolens “sees” a day where we can live, at least optically, a completely reality-free life. Columnist David Carr talks about what that means, and suggests watching British-made Netflix series "Black Mirror" for a glimpse at the creepy factor. It "asks fundamental questions about where this is all headed, not by creating an improbable dystopian future, but by hitting us right where we live. Its world is just one click away from the one in front of us."