Well VISIBLE during the whole visit,
Money Heist Season 1, Episode 1
A VISIBLE rib cage.
The Big Bang Theory Season 10, Episode 18
...but the added fun of subatomic particles
and waves outside the VISIBLE spectrum.
The Big Bang Theory Season 8, Episode 19
Three guys up at the gate,
two VISIBLE, one in the blind.
Breaking Bad Season 4, Episode 7
No VISIBLE reaction.
The Big Bang Theory Season 7, Episode 5