The control system may be
INVISIBLE to us.
Westworld Season 2, Episode 10
...and shouts, "Who wants
to take a ride in my INVISIBLE plane?"
The Big Bang Theory Season 4, Episode 5
...this is for the INVISIBLE kids.
The Big Bang Theory Season 8, Episode 22
Invisible, unwanted and unloved...
The Big Bang Theory Season 4, Episode 22
I think the word you're
looking for is... "INVISIBLE."
The Big Bang Theory Season 5, Episode 17