# Same speed. Why does one feel faster?

- Series: [How Cameras](https://miu.fm/howcameras.md)
- Premieres: 2026-11-02
- Page: https://miu.fm/howcameras/same-speed-why-does-one-feel-faster

## Story

Same speed. Why does one feel faster?

Both cameras fly at 45 mph. One skims 5 feet off the grass, the other is 100 feet up. In 1950 the psychologist James J. Gibson described how the ground streams past a moving eye: the nearer it is, the faster it flows. Drop from 100 feet to 5 and the ground streams 20 times faster, at the same speed.

There is a second signal: how many lines rush past each second. Height doesn't change it, and in a 1990 study it explained more of how fast people felt they were going.

Road engineers used it. Bars painted across the road, closer and closer together, make drivers feel they are speeding up, so they slow down. At 42 British roundabouts, yellow bar markings cut the share of speed-related crashes by 57 percent, and at the pilot sites the cut held for four years.

On film it's a convention, never tested: when a film wants speed, the camera rides low. The field, the road, the stand-in and the cameras here are our own models, built and lit in code.

Did you feel it?

Sources: Gibson, The Perception of the Visual World (1950); Larish and Flach, Journal of Experimental Psychology: Human Perception and Performance (1990); Denton, Perception (1980); Helliar-Symons, TRRL Report LR 1010 (1981).
Music: made with ElevenLabs Music. Sounds: made by us.

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