When rival football fans watch a game, each group feels that the referee is biased against their own team.
Both Democrats and Republicans claim that the electoral map works against them. On seeing the same presidential debate, both sides also routinely claim victory for their own side.
When partners who live together are asked about their individual contribution towards household chores, their answers often add up to more than 100%.
Academics across subdisciplines think they have a harder time with journal reviews, grant panels and tenure committees than peers of other subdisciplines.
This list could go on and on. It illustrates how it is our own beliefs that shape our perception of reality rather than the other way around.
Seeing is not believing; believing is seeing!
You see things, not as they are, but as you are. – Eric Butterworth
See also: Headwinds/tailwinds asymmetry