Her tale of physical disability depicts an inner transformation. Poster Child: A Memoir by Emily Rapp. Bloomsbury, 226 pp. This semester my freshman honors students and I have read six memoirs and Sven Birkerts’s The Art of Time in Memoir (reviewed) in my themed composition class, “Tales of Dangerous Youth.” As with novels, coming of age stories are common in memoir. It has pleased me to see students who hadn’t read a memoir, or who had read one bad one, …