Much of the Wachowskis’ Jupiter Ascending takes place on alien worlds with vistas and creatures brought to life with complicated CG builds. But one scene, in which Jupiter (Mila Kunis) and Caine (Channing Tatum in antigravity boots) are pursued up and around the city of Chicago by alien ‘shadow’ spacecraft, required a more practical approach to shooting. Not only did the Wachowskis want to film the real actors and stunt doubles as much as possible, they also wanted to acquire real – and flexible – background plates.

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