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I didn't found the story so fascinating as other Lionni's books. The story tells about two friends growing up, one becomes a frog and the other a fish, and there is the idea that the frog is living in a wonderful world, the fish is envious, and the fish cannot live in such a nice world because it is made differently and that's it (fish is fish") at at the end the fish is resigned about it. A book with similar idea but with different and better approch is Leo Lionni "Alexander and the wind-up mouse" that is much better developed as the idea is that a mouse look at a wind-up mouse with envy because he thinks he has a better life of him, but at the end he finds out that, yes, the toy mouse is loved, but he cannot decide for himself and could be thrown away, so at the end he understand that it's real mouse life is much better than the toy mouse life.