Exploring informed personal bias, or lenses. There is so much knowledge that humans have generated, knowledge which has only been created and refined through interaction with other pieces of knowledge, that when we look through our lens at other aspects of reality they seem to hold true, because they are. Knowledge built upon knowledge built upon knowledge.
Some fun links in case you want to read up on some topics:
Sense Data
Kant’s Idealism
Husserl (Founder of Phenomenology)
Idealism
Phenomenology