The characters' interactions with the shadows evolve throughout the story as they begin to realize that the shadows hold a deeper significance than initially thought. Initially, the characters may view shadows as simply a natural occurrence or a reflection of light. However, as the story progresses, they may start to notice patterns in the shadows or even see them as a metaphor for hidden truths or emotions. This evolution in their perception of shadows can lead to a greater understanding of themselves or the world around them.