The Grand Budapest Hotel (2014)

Wes Anderson gives each time period its own shape. The hotel's 1930s heyday is in the near-square 1.37:1 of that era's movies, its faded 1960s self is in wide 2.40:1, and the 1980s framing story sits at 1.85:1. Once you notice, the frame tells you which layer of the story you're in, and the squarer prewar sections feel like stepping into an old film. If you only watch one movie on this list, make it this one: it is the best-known example, and the changes are easy to follow on a first viewing.