The picture that was just posted shows two pictures that are exactly the same: a hat that is sitting on a seat.
The people have nine seconds to figure out what three things are different about the two pictures. The two pictures are not the same in three ways.
It depends on how well the readers focus on what the changes are between the two photos.
Several studies have shown that doing these kinds of activities stimulates the parts of the brain that are in charge of remembering and focus.
Those people who couldn't find the answers are expected to do these kinds of activities regularly in order to improve their observation skills.
Those who are reading this might proceed to match their responses with the solution that is supplied above.