Wigwag

You need light that is unsettling—that flickers, that jitters, that gives the eye no rest. This is precisely where the wigwag comes in. A lamp or a diffuser is moved rhythmically back and forth, oscillating at a high frequency. The result: a shimmering, unstable brightness pattern that immediately signals tension, chaos, or technical failure. In contrast to static light or a gentle fade, the wigwag creates active unease—visually and psychologically.

In practice, it works like this: You mount a light (usually a Fresnel or a PAR) on a stand or a rigging construction that you make oscillate by hand or mechanically—for example, with a small motor or a simple sling system. Alternatively, you hold a large diffuser or a reflector in front of the light source and move it rhythmically. The frequency determines the character: a slower wigwag appears more surreal and disturbing, a faster wigwag creates palpable panic. Accident scenes benefit greatly from it—police siren effects, emergency lighting, broken neon tubes. The wigwag is also your tool in science fiction settings when systems fail, or in horror scenes for psychological disorientation.

The critical point: Wigwag must be used subtly. If used too frequently, it appears artificial and destroys the credibility of a scene. Use it deliberately, as dramatic exclamation points. In combination with sound design—screeching tones, sirens—the effect is significantly multiplied. Also, pay attention to camera movement: a static or very slow pan enhances the wigwag effect, while fast camera moves can visually consume it.

Technically, you should know that fast oscillation can interfere with the camera's frame rate—moire effects are possible, especially at higher frame rates. Test before shooting. In editing, you can also create wigwag effects retrospectively using keyframe animation of brightness curves, which offers more control but has less authentic shadow dynamics than real practical lighting.