the sky might be thought of as negative space. or it's almost as easy to think of the sea as negative space. your title suggests the entire photo is negative space. and even the negative sea is wiped out further by the long exposure blurring it. This is like reality with an eraser rubbed on it a few times... blurring the details but enhancing the color and feeling.
I am torn on this one. I love the image, the mystery and the colors, but for this challenge I want a something that all this big empty sets off, and all we have here is the no ships. Close to the top, but for one little bump on the horizon, it would have been a contender.