Robert Louis Stevenson's poem "My Shadow" reflects the way in which a child might think of a shadow, without understanding the physics behind the way the shadow works. For example, the narrator, who speaks in the voice of a child, notes the way in which his shadow goes around with him and jumps into his bed before him. The narrator also notes the way in which the shadow gets suddenly bigger and smaller, without growing in the slow way a child does, and the way in which the shadow always stays close to the narrator.
In the end, the narrator does not understand why the shadow doesn't accompany him outside on a sunny day (when, of course, the bright sunlight would make shadows impossible). The narrator's diction and the way in which he describes what he sees around him mirror the way a child would see the physical world.