03/05/2014 AT 12:15 PM ET
Before she nabbed the Best Supporting Actress award for 12 Years A Slave at the 2014 Oscars – and became one of Hollywood’s rising style icons in the process – Lupita Nyong’o honed her craft at the Yale School of Drama.
Yale’s Chair of the Acting Department Ron Van Lieu, who auditioned Nyong’o, says the Oscar-winner relied on “instinct and an innate sense of truthfulness” when she first started. “She’s incapable of lying as an actor, so she had all of that but very little technique.”
Mexican-born and Kenyan-raised Nyong’o, 31, was hit by the acting bug after watching Steven Spielberg’s 1984 film The Color Purple starring Whoopi Goldberg and Oprah Winfrey.
“I was 9 when I watched The Color Purple,” Nyong’o tells PEOPLE. “It was the first time I remember seeing people who look like me onscreen, my textured hair and complexion. It struck me that I might want to do that someday.”
She went on to study acting at Hampshire College and later enrolled in Yale, where she starred in numerous productions that ultimately got her the audition for 12 Years.
Here are rarely seen photos of the Oscar winner on stage during her grad school days.
For more on Nyong’o’s life before the Oscars, pick up this week’s issue of PEOPLE, on stands Friday