Why do we “like” things? Why do we “heart” things? Does love mean swiping right? Does it mean holding the door for someone who has their hands full?
Maybe it's all of those things. Maybe we can’t define it.
The same photograph is ontologically impossible. But it is enough to spend a few minutes on Instagram, Flickr or Tumblr to see that a similar photograph is not only possible but is in fact quite frequent.