Simply put, this book is about human efforts in trying to understand why the daytime clear sky is blue. In the earliest parts of the book, ancient thought on this issue is discussed; hence, the arguments are more philosophical in nature, as one would expect. As the book progresses, more and more recent, and hence more technical, arguments are presented. Finally, the latter part of the main text involves the latest, fairly detailed scientific explanations for the blueness of the sky. The prose is kept simple and technical arguments are very clearly explained. Over 40 pages of notes are included at the end of the book where the reader can find references and more detailed explanations for the some of the material given in the main text. Finally, the book contains descriptions of simple experiments that one can try at home - experiments that are meant to illustrate some of phenomena described in the book. Adequately illustrated with useful diagrams, this book would be of interest mainly, I believe, to science buffs.