For primary grades the focus is related to what is being taught, a story that will relate to the students. For primary grades the story is kept under five minutes to retain attention. Vibrant pictures, age-appropriate music and narration are needed. Narration accompanied by subtitles can also help build vocabulary. Content-related digital stories can help upper-elementary and middle-school students understand abstract or layered concepts. For example, in one 5th grade class a teacher used digital storytelling to depict the anatomy of the eye and describe its relationship to a camera. A fifth grader said, "This year I have learned that places are not just physical matter but emotional places in peoples' hearts. iMovie has made all my thoughts and feelings come alive in an awesome movie."