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Hidden Connections, Double Meanings:
This book subverts and surprises. It explores mathematical topics, finding amazing similarities and looking at familiar objects in new ways. It shows mathematics as something mysterious, intriguing and pleasurably puzzling. You do not need to be a mathematician to enjoy this book. The style is relaxed. It emphasises insight and imagination rather than technique. The book also includes many problems and puzzles for you to try, with hints and solutions. [via]