yet , on another level , this latest sequence seemed part of a larger and longer arc , an arc that began that day she came home from school and watched her fatherthis same though changed body hidden beneath the sheetsarched in rhythmic undulations over the girl shed trusted to be her best friend , an arc that continued through her exodus from a home and family that no longer existed , exodus from a childhood and adolescence balked in an instant , an exodus that also marked an entranceinto adulthood , where possibility was constrained , potential truncated , hope starved .