A book has a STORY. A song has a STORY. People around you have a STORY. A photo has .....
It has a story, but it is your story. In a movie or book you have more details and background. A photo only has less than a second information. Most of the time it does not tell a clear story. The STORY you have is what your imagination sees.
Look at the pictures! Do you know what is going on? No! You have a story in your mind, but you will never know what happened. Maybe your story in your mind is the exact the same what happened. Maybe. But you will never know for sure.
That's one of the reasons photography is so amazing! It fires up your imagination. It lets you decide what to see.