In the spring of 2011, Steven Spielberg received a hand-addressed package at his office on the Universal Studios lot, marked ominously with a skull and crossbones. The director, who was months from starting production on his next movie, "Lincoln," closed his door, opened the package and removed an old pocket cassette recorder.

"I literally for 10 minutes was afraid to turn it on, because I expected that whatever I heard on that tape was going to be my film, my entire film," Spielberg said. "I was just savoring that last little moment … until I took the tape out and pressed the button, and that's when Abraham Lincoln spoke to me."

Actually, the voice on the recording belonged to actor Daniel Day-Lewis, who had spent months perfecting a reedy, Middle American twang for the performance he was about to deliver as the 16th American president. Lincoln's voice would be crucial to the film — in the script, by Pulitzer Prize-winningplaywright Tony Kushner, the nation's leader's extraordinary use of language plays a starring role.

"Lincoln" covers just four months of the president's life, an intense period in 1865 when he pressed for passage of a Constitutional amendment to end slavery as the Civil War was grinding into its fourth year. Alongside his exertions as a politician, the movie shows Lincoln as a concerned family man comforting his grieving wife and two sons — he had lost two of his boys already to illness.

Initially, Day-Lewis said, he was hesitant to take the part, describing himself as feeling "intimidated" by Lincoln and unmoved by early versions of the script. But it was the intimate view of the president in Kushner's treatment — as a man, not a monument — that ultimately drew in the London-born actor.

"The thing that surprised me from the moment I began to try to move towards an understanding of Lincoln's life was how accessible he was," Day-Lewis said in an interview in Beverly Hills in October, with Spielberg and Kushner by his side. "I wasn't prepared for that. I thought it was going to be tremendously difficult to discover him, the way he was as a man."

With the film now in theaters, a very modern Day-Lewis, who has tattooed forearms and spiky gray hair, has become a kind of quiet advocate for Lincoln's quaintly personal style of statesmanship.

"Lincoln was blessed with a quality of genuinely being interested in people," Day-Lewis said. "He didn't have to pretend.... Face to face, people sensed that he was not just looking at them, he was seeing them."

Though Day-Lewis didn't sign on to the project until 2010, Spielberg had been living with visions of him playing Lincoln for nine years.

In 2001, Spielberg optioned historian Doris Kearns Goodwin's book "Team of Rivals: The Political Genius of Abraham Lincoln" before she even finished researching it. (Though inspired by the book in its admiring depiction of Lincoln, the movie ultimately covers a time period that takes up only a few pages of that text.)

The director courted Day-Lewis for the part, then actor Liam Neeson for a spell until the development stage dragged on and Neeson turned to other projects. Spielberg kept returning to the reticent Day-Lewis, drawn, he said, by a quality of humanity he saw in his performances.

Day-Lewis' creation of complex, masculine-but-vulnerable screen characters has earned him four Oscar nominations: for playing Christy Brown, an Irishman born with cerebral palsy, in "My Left Foot" (1989); Gerry Conlon, an Irishman wrongfully convicted of a bombing, in "In the Name of the Father" (1993); Bill the Butcher, an Irish American crime boss, in "Gangs of New York" (2005); and Daniel Plainview, an irascible American miner, in "There Will Be Blood" (2007). (He won for "My Left Foot" and "There Will Be Blood").

"In all of his films, even in the most gripping and negative characters like Bill the Butcher, there was, underneath all of that aggression, a misunderstood compassion," Spielberg said. "I just saw a great reservoir of tremendous patience and compassion. Everything I thought I knew about Lincoln, I thought I had found some of that in my presumptions about Daniel as an actor. And maybe a little bit under that surface, Daniel as a person."

In 2010, Spielberg and Kushner traveled to Day-Lewis' home in Ireland in a final effort to persuade him to take the role. When the actor finally assented, it was with the proviso that he have a year to prepare, immersing himself in Lincoln's life and his words. Through reading Lincoln's speeches, Day-Lewis said, he found his distinctive speaking voice, which is informed by reports of the time that Lincoln spoke in a high pitch.

"On any given day, I learned quite a number of pieces of Lincoln's writing, so that I could live with those every day and speak them every day," Day-Lewis said. "The voice is a very deep, personal reflection of character in one way or another."

Physically, Day-Lewis, 55, was well equipped for the part — he is naturally long and angular, like Lincoln, who was 6 feet, 4 inches.