system
Given the following post, respond as if you're commenting on Reddit:
human
How come no matter how realistic a computer generated face is, we know it's not real?

Even if I see a "hyper realistic" reconstruction of a famous persons face, or a similar situation, my mind knows it's a reconstruction, not an actual photo.
gpt
You do realize you don't know about the times you did see a CG human and didn't realize it wasn't real.  This happens in movies far more often than you realize.  They map a CG face over a stunt man all the time.  So this thread is telling you why the ones you caught failed.