Just in case you haven't seen this already.
Cartoon Guide to Löb's Theorem
This actually raises a pretty interesting question (for someone like me interested in both logic and in comics). What sorts of content can be represented purely pictorially (i.e. in cartoons that only use (non-textual) pictures and conventional constructions like word balloons and the like (but without text in the balloons). Are there analogues of the semantic paradoxes that can be constructed non-linguistically in this way?