Why People Perceive Things Differently?

George Kelly (1905-1967) explained that "differences in personality result largely from differences in the way people construe the world" (Burger, 2011, p. 412).

According to the cognitive approaches theory, we interpret a situation very differently, leading to different responses to that same situation.

"The relatively stable patterns in our behavior are the results of the relatively stable way we construe the world" (Burger, 2011, p. 413).

How can two or more people participate in the same situation and have different impressions of that particular situation?

Why do we have different perceptions?

Usually I perceive things in a positive way. I am a happy person and I "construe the world" in a joyful way.