Brian Greene's mention of "Flatland" in "The Elegant Universe" sparked interest in this classic novel, which explores a two-dimensional world. Readers have noted that while "Flatland" is an entertaining read, those familiar with "The Elegant Universe" may not find new insights, as the geometric concepts presented are now considered common knowledge. The book is praised for its accessibility and remains a popular choice for those interested in mathematical fiction. Additionally, it is available for free as an ebook due to expired copyrights, with links provided to access it through various platforms like Project Gutenberg.