Inattentional blindness happens all the time. It occurs when our attention is focused elsewhere and we are unable to notice objects that are in plain sight. Inattentional blindness is also known as selective attention. People tend to select one sensory channel and block out everything else. People will focus on what they are told to focus on, or on what they want to. An object is usually undetected because your attention was on another task or event. We are unaware of these events because there is many different things are happening in the world and it's impossible to notice everything. I believe that this phenomenon is important because it proves that people are unaware of such obvious things. This explains why people don't hear you or see things that are in plain sight while they are concentrated on something else. This has occurred in my life when I was watching a hockey game. There were kids starting to fight in the stands about 10 rows below me. Cops came and took them out of the arena and it was a big scene. But i was so focused on the hockey game that I didn't notice anything. I had no clue that it even occurred. I am wondering how this happens? Things occur that are so obvious and you think that you would see these events, but somehow you miss it all. It's weird to think about because think how many different things in your life so far you have unintentionally blocked out. Here is a picture from the 'Invisible Gorilla' video. This picture is when the gorilla was in the scene. Although the gorilla seems so obvious now, almost no one saw it while watching the video for his or her first time.