You almost create this infinite universe for the character that you're playing and then you're compromising it into the story that you're doing. Whatever character you're playing, you kind of explore endlessly more than what's on the page. You use that exploration to do the performance that's in the film, but hopefully, people will see all that work and preparation in those little glimpses of scenes and moments. Oh, there's something there. There's so much more happening with this character.

Bill Skarsgard on ‘IT’ and Tapping into His Fears to Create a Terrifying New Pennywise (July 28, 2017)