A famous psychological study in 1999 asked participants to watch a brief video of two groups of people passing basketballs —some dressed in white, some in black. The participants were instructed to count the passes among the players dressed in white. The correct answer was fifteen passes. Most people got this right, and thought they passed the test. Then the researchers asked, “Did you see the gorilla?” During the video a person in a gorilla suit had walked in and out of the