This document discusses how attention and focus work. It explains that people tend to focus on information that is meaningful based on their current mood, goals or expectations (top-down processing). This can lead to inattentional blindness where unexpected but salient information is missed. The document analyzes a video where people watching focus on a girl but fail to notice signs another student is planning a shooting. It concludes that attention is like a spotlight that can be directed elsewhere despite an object being in the center, and preexisting schemas can cause people to miss unique things before their eyes.