The idea presented is that nonfiction books raise the reader's floor while fiction books raise the ceiling. This concept is thought-provoking as it addresses creativity and imagination for fiction and cognitive knowledge and connections for nonfiction. The speaker is still processing this idea but finds it compelling. Additionally, the speaker is considering reading a book on paper as an experiment to see the difference in experience. Lastly, the speaker mentions an unsuccessful attempt to formalize a side quest in their day.