‘After World War I, everyone felt robbed of their innocence,’ the actress says.

‘[Pooh] gave a little bit of that back.’

Goodbye Christopher Robin

Domhnall Gleeson and Margot Robbie are headed to the Hundred Acre Wood.

Goodbye Christopher Robin

David Appleby/Fox Searchlight Pictures

“I’d never considered why Winnie the Pooh was so popular,” Robbie tells EW.

After World War I, everyone felt robbed of their innocence.

It gave a little bit of that back.

Goodbye Christopher Robin

David Appleby/Fox Searchlight Pictures

People needed that at the time and probably need it still today."

Newcomer Will Tilston plays the young Christopher Robin, whom his parents called “Billy Moon” at home.

When Milne’s books take off, Christopher Robin becomes a household name.

Goodbye Christopher Robin

David Appleby/Fox Searchlight Pictures

It was him, and Shirley Temple, and maybe some royal kids.

As a result, he and his mother have a more formal relationship.

The rest of the time, they’re with the nanny.

Goodbye Christopher Robin

David Appleby/Fox Searchlight Pictures

So that was what I had to get my head around.

That wasn’t an unusual thing to do."

“I kind of intentionally didn’t let myself get too close with Will,” she says.

Goodbye Christopher Robin

David Appleby/Fox Searchlight Pictures

“I did want there to be a formal sort of feeling between us in the scenes.

They’re not familiar with each other.

It also helped that Robbie was a lifelong Pooh fan as well.

Goodbye Christopher Robin

David Appleby/Fox Searchlight Pictures

“There definitely was a sense of nostalgia for me,” she says.

So that struck a chord, obviously.”

We had to see them having fun together and giggling and dancing."

Goodbye Christopher Robin

David Appleby/Fox Searchlight Pictures

Goodbye ChristopherRobinwill hit theaters Oct. 13.