Designing interfaces is all about telling stories. You as the designer are telling the story that the eventual user will journey through. Often we write up detailed descriptions of the character, map out their path through the world, and give them some hook that pulls them through the narrative. From there, visual design takes over and we start detailing what the world looks like and how it behaves. In order to complete the story though, we have to live in it for a little while. Static screenshots for a dynamic design can’t convey the story we’re trying to tell, there just isn’t enough context. If we design an interface without prototyping first, we’re telling an “I guess you had to be there” story.