User blog comment:Admiral Leviathan/We Did It Again/@comment-3060566-20100914011001/@comment-11644326-20100914011417

It is a term in fan-fiction or television, that defines the element dividing the fiction world (Like a TV show) between the viewers.

When a fictional character acknowledges that s/he is a work of fiction, talks directly to the audience etc. s/he is breaking the fourth wall. My two characters are the authors of the comic they are in, which is breaking the fourth wall automatically. The fourth wall was broken in this comic, because Shadow can be seen trying to duck underneath the text-bubbles in the third cell.