Puzzled

Starting last Saturday, we've been working on a jigsaw puzzle on our glass living room table. It started out looking something like this.

After a few days it was starting to take shape:


It was not long after this point that I was sure, absolutely positive, that we were missing some pieces.

And last night we put the last piece in place while watching/listening to a documentary on Abraham Lincoln. It was a sort of psycho-history which looked at how his lifelong struggle with depression was in many ways critical to him being the leader that he came to be.

The title of the puzzle is Friends in Summer.