A familiar person whom I have known since childhood. But suddenly, after looking at him for a long time, his face looks different. This has happened to me many times, what is the reason?

Changes in perception of familiar faces might be linked to various factors, such as stress, fatigue, or even subtle shifts in your mental state. It’s not uncommon for our perception to fluctuate based on our emotional and psychological well-being. If this continues to be a concern, consider discussing it further with a mental health professional to explore potential underlying factors.