Filmmakers may assume that because they show something on the screen, the viewer has noticed it but, as this short video demonstrates, viewers may miss important visual elements if their attention is focused elsewhere.

The Soloist is based on the true story of L.A. Times reporter Steve Lopez's friendship with Nathaniel Ayers, a homeless, Julliard trained cellist. Ayers was a brilliant and promising student, but his battle with mental illness consigned him to wander the streets of Los Angeles playing a broken violin...