^^^ actually these perforated aluminum masks make you aware of how far you are sticking out of the bunker.
I've mentioned it before, but these do not let shell through. The only "but" is that they don't slow the paint down. Which doesn't hurt, it's just very surprising.
Imagine the dentist, out of nowhere, just sprayed you in the face with his little water gun instead of on your teeth like you were expecting.