It's called the focusing illusion

It's called the focusing illusion. "Nothing in life is as important as you think it is while you are thinking about it," as Daniel Kahneman explains. The more narrowly we focus on a particular aspect of our lives, the greater its apparent influence. At the beginning of the description above, I concentrated almost entirely on the weather-ice in New York, sun in Miami Beach. This aspect was therefore dominant when I asked you to compare the satisfaction of living in New York with that of living in Miami.

— from The Instruments (Awareness/Perception/Expectations)

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