n. (from Japanese pika meaning spark)

  1. A photograph or video in which a point light source is moved during a long exposure to leave a drawing in the frame.

Pikapika is a photographic technique of making a long-exposure still photograph in a dark space. A person with a small flashlight uses the exposure time to draw a picture in the air. Do this a number of times with animation in mind, and you get a short video of a neon-like cartoon floating in air. The apt subtitle of the pikapika site is “lightning doodle project”. —Ned Batchelder, “Pikapika”

Pika may be most familiar to English speakers in another context, chu being the sound mice make.

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