For instance, in Dictionopolis (a city of words) Milo is invited to a banquet at which one must eat one's words. Just as in our world, sometimes those words can be sour and very hard to swallow.

Also, while you can jump to the Isle of Conclusions, you must reach the mainland again only by swimming through the sea of knowledge. And the water is cold. It is not easy to recover from having jumped to conclusions.

The interplay between concepts, the tension between words and numbers, the divisions and alliances that are made, the enemies who seem to be friends, all of these serve to make a delightful play which will interest children and adults.

Milo, of course, makes it home safely after a fascinating journey, and while he would like to take another trip, the phantom tollbooth is needed elsewhere for other children, too. However, Milo realises that he has his own tollbooth in his imagination, and thus the adventure need never end.

No bright child of 7+ could fail to be captivated by this tale. Milo is a bored boy who finds an unexpected present waiting for him on his return from school. It's a tollbooth (it doesn't matter if you don't know what this is). He assembles it, gets into his toy car and the moment he drives past the tollbooth finds himself in a magical land. Once ruled by two brothers, King Azaz the Unabridged (or words) and the Mathemagician, it is falling to rack and ruin because of the exile of the Princesses Rhyme and Reason. But danger lurks at every turn - not least that of Milo failing to notice what's going on. He immediately finds himself driving through the Doldrums, and only Tock the heroic Watchdog can rescue him by waking him up and forcing him to concentrate. His adventures include jumping to Conclusions (an island that looks lovely from afar but it a bleak overcrowded desert on arrival), orchestrating Chroma's colourful orchestra, breaking the Soundkeeper's fortress and learning about infinity - even before he ventures into the demon infested mountains to find the stair to the Castle in the Air.

Packed with splendid jokes, puns and brain-teasers, what is so special about the book is that it encourages children to think about a huge variety of subjects without ever hectoring them. Why is it important to notice details of daily life? Why does it matter that you choose good sounds rather than the ones adored by Dr. Kakphonous A. Dischord and his Dreadful Dynne? Why should you grow up rather than down? What do figures of speech mean, when taken literally? Why is it important to go on learning all through your life?

I read this to my 7 year old, and he loved it so much that it's become the gateway to loving reading. He tries to walk around reading it, and takes it with him wherever he goes. I had exactly the same reaction at the same age - as did my daughter. Just don't judge it by its ghastly cover.