This is a project that I enjoy doing with the 1st graders. We talk about positive and negative space and what each means. Then we get a small piece of construction paper and draw an organic shape line that starts and stops on the same side of the paper. Once that is done, we take the piece of paper that the edges are still intact and glue that onto a large sheet of construction paper. Then we fit the piece we cut out into the negative space like a puzzle piece and put glue on it. Once it has glue we flip it so that it becomes the positive space. Its a lot easier than all of that explanation and they turn out great.