An Illusion is anything which is perceived, but is not real. There is no functional difference between illusions and hallucination, but hallucinations are generated by the brain, while illusions are created by people.
It is the illusion of something. Video games, for example are simulations. War Video games are illusion of war
when you see a person on the screen, there isn't actually a person there.
Centrifugal force is an illusion, and doesn't really exist.
Based on illusion; not real. Example: do not live in an illusory world.
seeing thing spin and getting dizzy and neutias
This is the illusion.
illusion
It is difficult to give examples here, but consider the optical illusions in the attached link.
Illusion (feminine)
A mirage is a desert illusion.
No, it is not an optical illusion.
The Müller-Lyer illusion is an optical illusion consisting of a stylized arrow.