Here's a bit of text and image from Film Art Blog directly cut and pasted. It is a snazzy blog some (most) of the time. This section is on the "gradation of emphasis," a term used to describe the steady accumulation of objects / subjects in a frame, and how different filmmakers use the technique.
"Tati as well likes to create an interplay between primary and subsidiary centers of interest. Or rather, he sometimes abolishes our sense of what is primary and what isn’t. The crowded compositions of Play Time (1967) often bury their gags in a welter of inessential details. During the lengthy scene in the Royal Garden restaurant, a minor running gag involves the dyspeptic manager. He has just mixed some headache medicine with mineral water, but the action is easily lost within the tumultuous image. Even the soundtrack cues us only slightly, with a bit of fizz among the music and crowd noise.
As the manager lowers the glass, Hulot thinks it’s pink champagne being offered to him.
Rolling the stuff in his mouth, Hulot realizes his mistake as he earns a stare from the manager.
There is so much competing sound and activity in the shot that some viewers simply don’t notice this bit at all. In Play Time, gradation of emphasis is often flattened out, leaving us to rummage around the composition for the gag."