Almost everything else blends naturally into the supposed setting.
The lockers have the worn, industrial appearance associated with older American schools. The students are carrying physical textbooks. Bell-bottom-style jeans can be seen farther down the hallway. The hairstyles and general fashion choices also closely resemble photographs from the mid-1970s.
Your eyes therefore accept the scene before your brain begins examining the smaller details.
Then you see the watch.
It is a perfect example of how a single modern object can completely change the way we interpret an image.
Interestingly, people often miss details like this because the brain tends to process an entire scene before focusing on individual objects. If the overall setting matches what we expect a 1970s school to look like, we may automatically assume everything inside the photograph belongs to the same period.
