illusion

US /ɪˈluː.ʒən/
UK /ɪˈluː.ʒən/
"illusion" picture
1.

a thing that is or is likely to be wrongly perceived or interpreted by the senses

:
The magician created an amazing illusion.
The desert heat created an illusion of water on the road.
2.

a false idea or belief

:
He was under the illusion that he could sing.
Many people live with the illusion of control over their lives.