The Oscar-winning actor Viola Davis traces her career in Hollywood back to a single moment of inspiration from her childhood: watching Cicely Tyson star in the 1974 movie “The Autobiography of Miss Jane Pittman.” “I saw excellence and craft, and I saw transformation,” Davis tells David Remnick. “And more importantly, what it planted in me is that seed of—literally—I am not defined by the boundaries of my life.” In a new memoir, “Finding Me,” Davis writes of a difficult upbringing in Rhode Island, marked by poverty and an abusive father. She pursued her dream of attending the prestigious Juilliard School, but felt alienated by a white-focussed approach that left little room for her background or identity. She talks with Remnick about how she grew past these early challenges, the lingering impostor syndrome that many successful people experience, and how she prepared to play Michelle Obama in the series “The First Lady.” Plus, the cartoonist Liana Finck, a regular presence in The New Yorker, explains how a ride on the Long Island Rail Road gets her creative ideas flowing; she can work among people without anyone talking to her.