There was a psychological study done where people were asked to watch a video and tell how many times basketballs were passed by a group of people. 

About half of the people watching were so focused on counting the passes that they did not see a “gorilla” walk through the middle of the group and beat his chest.

You can see an example of the video HERE

You and I are wired to filter out a good deal of “reality.”

Your brain takes in 2.3M bits of information each second.

It filters out 99.994% of this information. It Deletes, Distorts, and Generalizes.