Size for the frame

Four rules keep a performance alive and the right size [proven].

• Size for the frame. In a wide, reactions the whole body can read. In a close-up, nothing but the eyes and the thinking behind them.

• States, not transitions. Open already in the state, mid-reach or mid-turn, then chain the beats one after another. Never ask the face to travel from neutral to the feeling.

• Two to four visible beat changes per scene: a pause, a new posture, a new pace, a look that shifts.

• A physical job running under the dialogue: kneading, folding, packing a bag. The biggest accent comes when the hands stop.

In a speaking shot the hands stay out of frame or still (see Performance → Hands and touch points).

Why: restraint is the screen actor's default size. "In terms of voice and action, less is more," as Michael Caine put it; effort reads on camera as tension. Luma's Seedance 2.5 guide reaches a similar count from the tool side: three or four beats that matter in every 15 seconds.

Sources

• Michael Caine, Acting in Film (article; masterclass notes); Luma's Seedance 2.5 prompting guide.