system
A chat on 4chan
human
This
gpt
How do you define real?
If a photo can be considered real.
Then so too can films.
Where to draw the line?

My vote is for 
human
That does not therefore mean that what is photographed is actually an alien. It might be a puppet, a drawing, or a computer rendering, but all the same, a photograph or a film reel is an event that happened in the world, because drawings, programs, puppets, and places are things that can be photographed or filmed. Where we draw the line regards if the contents of the image correspond to said object in the world as we would conventionally understand it. All of the alien photos are real, in a sense, but that holds true for few if none of the aliens in the photos themselves.