sound film, n.All

Sound film (n.) changes ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠the picture itself: when the sound fails, the still-gesturing face thickens, freezes and looks nonplussed.

The Sound film (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠built so that following it takes a quick, observant mind, yet it forbids the viewer to think, on pain of missing the fleeting facts.