To five-year-old Jack, Room is the world. . . . It’s where he was born. It’s where he and Ma eat and sleep and play andlearn. There are endless wonders that let loose Jack’s imagination -- the snake under Bed that he constructs out of eggshells;the imaginary world projected through the TV; the coziness ofWardrobe beneath Ma’s clothes, where she tucks him in safelyat night, in case Old Nick comes.Room is home to Jack, but to Ma, it’s the prison whereshe’s been held since she w