I would agree with glbeas and go a step further.

The image of the mountain stream I'm sure I saw but honestly can't remember it.

The abstract I can remember today. My response to it at the time was 'why is he showing me this? What am I to take away?'

Perhaps the photograph is an answer to a question we did not know we had?

Wouldn't it be nice if people looked at our photographs and said: I see, now I understand.