passing through

“when the water's too high
when the water's too high
I will carry you
I will carry you.

when the night is too black
when the night is too black
I will carry you
I will carry you"

~ Sixpence None the Richer, Carry You

Above: passthrough boxes for photographic film. Note the box at the upper left; our mutually- understood code was to leave 2 lids showing, to indicate there were no "live" contents to potentially expose to light.