The "Invisible Gorilla" is a famous psychological experiment conducted by Daniel Simons and Christopher Chabris in 1999. In this study, participants watched a video of people passing a basketball and were asked to count how many times the ball was passed. Surprisingly, many participants failed to notice a person in a gorilla suit walking through the scene, demonstrating the concept of selective attention. This phenomenon illustrates how our focus can blind us to unexpected events, even when they are right in front of us. The "Invisible Gorilla" experiment has become a key example in discussions about perception, attention, and cognitive psychology.