A child’s-eye view of the day Rosa Parks would not give up her seat. On Dec. 1, 1955 in Montgomery, Ala., a boy and his mom sit at the back of the bus, and he amuses himself by rolling his tiger’s-eye marble down the bus aisle. “Mrs. Parks from the tailor shop” rolls it back to him. Soon the bus is packed, but it does not move. The boy, acutely sensitive to the tone of his mother’s and the driver’s voices, wonders what is happening, but he sees that, like his mama, Parks has her “strong chin.” She’s taken away, the bus goes home and the boy holds his brown-and-golden marble to the light, thinking he does not have to hide it anymore. The language is rhythmic and inflected with dropped gs, with slightly overdone description, but clearly explains to very young children Parks’s refusal to give up her seat at the front of the bus to a white man. Cooper uses his “subtractive method” on oil color, in which illustrations are rubbed out or lightened, making the pictures glow with burnished grace. (Picture book. 5-9)