How does Berson exercise his panache via a mouse in a drab city apartment? Why he sets him to dreaming, of course -- about elegant mice in armor, cows and sows in the country, and the horned nine-foot moose (from Uncle Jack's encyclopedia), which young Victor confuses with one of his own species. The resulting overblown notion of his own future self causes Victor to harass the building cat and get away with it -- and that's that. The fluent clarity of Berson's illustrations is always a cleansing visual experience; unfortunately the spareness of his pages here is echoed in the thinness of the story, which can't stand up to Berson's French folktales as an attention holder. Still, a pretty reverie.