Psychology: What we see is as much reality as we can deal with
We think we see reality, but reality is overwhelming. So of course we do not really see reality.
One of the functions of our brains is to edit out unnecessary items and present a picture our minds can use. And to fill in things we expect to see.
Of course, that is precisely how our minds can be tricked!
Here are a number of visual illusions courtesy Michael Bach and of Lowell Psychology.
(Note: Many illusions did not work for me but it is an individual matter. Try them and see.)