I loved House of Leaves. The most recent example where the 'shape' of the content really contributed to the experience, albeit in a much, much subtler way, was

I loved House of Leaves. The most recent example where the 'shape' of the content really contributed to the experience, albeit in a much, much subtler way, was Infinite Jest. While cramming stuff into multiple-page-long footnotes and footnotes with footnotes felt a bit gimmicky at first, a few experiences stand out: 1. getting so drawn into a long footnote that I forgot it was a footnote. The confusion upon getting back to the main story felt right for that point in the story (or the book in general) 2. a large number of footnotes that were mildly interesting at first and turned out to be hugely valuable later on (but not crucial to enjoying the book). 3. footnotes that were funny precisely because they were footnotes and somewhat self-aware of it. If you like Wallace' essays or the themes he kept going back to (depression, self-analysis, addiction, irony, media), I can highly recommend going through the effort of reading the book. It took me multiple tries over a period of maybe a decade to finally finish. Once I got past 200 pages it became difficult to put the (massive) book down and now, weeks later, I'm still thinking about it regularly. Few books have had that effect on me.