“I used myself as a barometer, honestly,“Marshall tells EW.

“Just say I wasn’t involved in this at all.

What would I be disappointed to see wasn’t in the film?

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And I knew I wanted to see an animation sequence in the 2-D style.

Here’s how they pulled it off.

Travers' original eight-book series, the possibilities were wide open.

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Marshall says Firth loved getting involved in the process.

“Actually, I would say they look even better on camera than they do to the eye.”

As Marshall puts it, the proscenium number is a key ingredient he couldn’t imagine not having.

If audience members getChicagoflashbacks, that’s no accident, either.

We created models and treated that stage as though it was completely real.”

“It was terror,” laughs Blunt.

They make these parts like tailored suits,” says Miranda.

And what’s really fun is that it looks brand new.

The animators stretched it and opened it and made it even more exciting and put their touch on it.

“With just the three kids, you have to help them imagine what they’re doing.

And you do it in pieces, which helps tremendously.”

“You do it in pieces like a mosaic.

“I’m still astonished watching it,” he adds.

Audiences, evidently, are too.