Wow! I love this book - it takes you places you've never gone, or even thought of going, before. It explores time travel in a new, spectacular way - a different world, where the whole purpose of travelling (or jumping) in time is to change the past, instead of pussy-footing around trying not to change anything! It's impossible to put a theme to this book; it explores so many areas of real life, but wrapped up in a silver lining of fantasy. I've also read one of the very first versions, and this final copy is so, so different! So many twists and turns which will keep you guessing right up until the final, stupendous climax. There are so many wonderful, vivid characters from all different times and backgrounds in this book, including a wise Scottish hedgehog and a very special pigeon whose comments will delight all. Although these characters are animals in appearance, they are human at heart and it is easy to imagine them as people if you dislike the idea of talking animals and toys. The name of the trilogy is so apt too - `Circles' is the perfect name for a book which revolves around orbits and pools and....well, circles! All in all, this book is not to be missed by anyone, any age who seeks adventure, mystery and laughter. Dive right in to the Pool of Colours and enjoy!