The transition from land to sea? I am probably not sufficiently intellectual to understand this, but for me there are some problems with the photograph: the composition seems rather 'grabbed', rather than considered, especially with the the division line falling so close to the centre. I am not keen with the perspective point from which the photo has been taken and would have preferred a lower vantage point, although that may not have achieved the affect you were looking for...
This is a great interpretation of the topic. I love it as a statement. Perhaps somehwere with some more character in the foreground (bigger rocks or more gnarled ones) and possibly a slightly longer exposure to highlight the everlasting but gentle aspect of the transition at the shore here.