Everywhere we look, we see screens. The other day I watched clips from a movie as I pumped gas into my car. The other night I saw a movie on the backseat of a plane. We will watch anywhere. Screens playing video pop up in the most unexpected places — like A.T.M. machines and supermarket checkout lines and tiny phones; some movie fans watch entire films in between calls. These ever-present screens have created an audience for very short moving pictures, as brief as three minutes, while cheap digital creation tools have empowered a new generation of filmmakers, who are rapidly filling up those screens. We are headed toward screen ubiquity.