The prologue establishes rules
Track who crosses a threshold and who claims the centre. A group can define an area by turning toward somebody who enters or by moving in unison to close a gap. The opening makes maps out of movement. In the original stage conception, audiences could read the territorial conflict before it was explained in dialogue.
The gym gives groups a shared beat
Look first at the ensemble. Do the groups mirror each other, occupy opposing areas or compete within the same pattern? Then follow Tony and Maria. Their meeting interrupts the larger rhythm and creates the feeling of a quiet space within a crowded room.
The camera supplies its own choreography
A stage director can arrange simultaneous actions and trust spectators to find a focal point. A filmmaker can use camera movement, framing and cuts to determine when the audience sees a reaction. Compare the same thirty seconds across the films and mark each time the shot changes the scale.
An exercise for rehearsal or class
Stage a neutral encounter with no script and no contact. Change only the distance between pairs and where they are looking. Ask observers when they inferred tension and which movement signalled it. The experiment isolates the kind of storytelling the musical achieves through spacing and timing.