The difference could be almost anywhere. It might involve the man’s clothing, face, hair, hands, the fire hydrant, or even a small part of the background. “It is hidden in plain sight,” so you will need to look closely rather than simply glance at the pictures.
Take your time and compare both sides from top to bottom. Pay attention to every line, shape, and color, because the smallest change can be easy to overlook. “Most casual viewers miss it on their first try because the contrast is quite subtle.” Try to find it in under ten seconds if you want an extra challenge.
