The authors of the book, leaning on their long and rich experience inteaching mathematics at various levels, are now presenting it withinand alongside a lovely fantastic environment. The first part of thebook, written in a fantasy style, may serve an interesting and joyfulreading for children since age 10. The second part, dealing with a realhistory of mathematics, in a popular presentation, may attract readersof any age interested in this area. The most promising readers – theyoungsters – can explore both parts profitably for their cultural andintellectual development. In addition to its obvious educational value,the book has, although less explicit, but no less importantpsychological advantage: it may help to get rid of negative feelingrelative mathematics to those who have it. The book is worth to beplaced on a shelf in every library, personal and public, and not tostand there motionlessly.