When Arthur sells his favorite stuffed bear to his younger sister, he feels sad and wishes he could have it back, but over time, Arthur begins to realize that he is the older of the two and it is time for him to begin to grow up by letting the bear go.When Arthur sells his favorite stuffed bear to his younger sister, he feels sad and wishes he could have it back, but over time, Arthur begins to realize that he is the older of the two and it is time for him to begin to grow up by letting the bear go.