Hm ... onions ... fish ... onion fish: In German a Zwiebelfisch is a character that by mistake is printed in a font different from the rest. So what did Isidre wish to tell us with this very painting that is (very probably) nothing but a d'arengada vermella (red herring)? It's obvious: But I won't tell you. Surely you will find out for yourselves, won't you? ;-)