That's quite a hard one. I'll tell you about a very odd book that I read when I was a child and it's stuck with me. There's a book called The Search For Delicious. I think the author's name is Natalie Babbitt, an American children's author. It's about a boy who sets off through a magical kingdom to find the definition of the word delicious, because the Lord Chamberlain is making a dictionary with the definition of every word and the whole court has a huge rumpus, an argument, about what is the most delicious thing.

So he goes through the whole kingdom doing a survey, asking everybody what's the most delicious thing. I must go and find that now and read it again.