There's a set of books called "I Can Read" books. How about an "I Can't Read" book?
What would it contain? Latin? Excessively long words written in tiny type? Gibberish? Sentences that curl around the page, full of differently colored characters with strange aspect ratios, some spanning multiple lines?
I'd say there should still be illustrations, but complex, incomprehensible ones, full of emphasis on what isn't being drawn, maybe with the characters fleeing some vague malevolent entity.