“How do you show character choice,” wonders Tony Zhou in this abridged version of his popular “Every Frame a Painting” essay series. Void of melodramatic “there’s no turning back” declarations, Zhou points towards Snowpiercer as a film that is constantly conveying its protagonists’ decision making process through right and left camera looks. Just as effective, if not a touch more subtle than its vocalized counterpart. Be forewarned: massive spoilers ahead.