Comics scholars like Scott McCloud have spent many a page on the meaning and importance of the gutter, the white space between a the different panels on a comics page where, it would seem, all the magic of visual storytelling happens. Here’s a series of ads by Havas Worldwide for the Paris transport authority, RATP making very good use of that “space between” to inform you of all the things you best don’t do while in the métro.
They’re quite funny stories, and they all have in common that whatever calamity happened, you don’t see it. It happens in the gutter. So mind the gap.