Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Right up there with Flatland

Thanks to whoever conceived the idea of publishing a combined version of Flatland and Sphereland - I would probably have never read this book otherwise - its under-known and under-rated. As a satire, Flatland is arguably better, but as a popular math / physics book, I find Spherland of a much higher quality. I would go so far as to say that there is no better way to understand conceptually the notion of a curved space than to read Burger's analogy. Get it before it goes out of print!