How casting can change a scene
Consider the following installation.
By itself, it could be almost anything. Maybe slightly ominous, depending on what the music is like.
Now let's add a character. Maybe a nice old lady astrophysicist .
So let's change it to some bloke scientist.
Everything is still probably fine, depending on the music. Just some researcher. This does not mean that things might not go horribly wrong, but they seem to be perfectly normal.
We can make it even more normal by using two characters -
OK, exposed brain alien dude. Let's face it, we're in for a rough and nasty ride. Probably with some awful acting. Or are we?
Honey! I'm home! I've brought drinks! Suddenly everything is OK, if a little odd. But who are we to judge?
Of course there are other directions for all of this. Consider
About which little needs to be said.