Rainbow fish was the most beautiful fish in the sea... but he had to give out all his shinning scales to exchange happiness because otherwise all other fish swam away. Well it could be about sharing but if you are reading from a different perspective - it seem accept being outstanding is not good. So an outstanding fish made no friend because others just jealous of him. In order to have friends and "happy", he has to come down to an ordinary one. The book itself is nice and shinning so excellent except I don't like the context.