“Everything we take for granted as reality is, in fact, an illusion of sorts. There may be an objective component to what we see, but much of that objectivity is limited. Further yet, a lot of it is clouded by our subjective judgments.”
It's a nebulous question lacking specifics.
Generally, reality is pretty real.
Perception of it, well, that can depend on a lot of things.
I remember this incident as a child very vividly. We try to look away at such reality.