Arthur C Clarke's 'Technical Error'
http://en.wikipedia.org/wiki/Technical_Error summarizes the plot of a short story Sean Ellis must have read as a child.
Being too lazy to read all the posts, is there a plausible theory here of how partial amnesia could imbue Gina's "broken" reflection with human emotional responses? (My understanding of concussions is that they suppress memories) Having enjoyed the film immensely, I am happy to overlook a "plot hole" (if that's what it is) that makes POV-paradigm-shift twist work, but was just hoping that someone had figured it out from clues/details I missed in one late-night viewing.