{
  "id": 11003950,
  "title": "What butterfly wings have in common with barbershop poles",
  "url": "https://urgent.news/2026/09/30/what-butterfly-wings-have-in-common-with-barbershop-poles",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-09-30T15:00:56.000Z",
  "source": {
    "name": "Ars Technica",
    "slug": "ars-technica",
    "url": "https://arstechnica.com/science/2026/09/what-butterfly-wings-have-in-common-with-barbershop-poles/"
  },
  "original_language": "en",
  "account": "The intricate patterns on butterfly wings share a fascinating similarity with the stripes of an old-fashioned barbershop pole. While the pole rotates around a vertical axis, humans typically perceive the stripes as moving upward, a well-known visual illusion known as the barber's pole illusion. This perceptual trick, a result of certain processing biases in human vision, is also found in the flight patterns of butterflies, according to a recent study published in the journal Nature.\n\nThe wing patterns of many butterflies, characterized by stripes and spots, effectively deceive predators, enabling them to evade attacks. The researchers from the University of Exeter explain that the butterfly wing patterns interfere with the eye's ability to gauge the direction and speed of moving objects, generating false motion cues and obscuring the butterfly's actual heading. This optical illusion disrupts the predator's basic visual targeting system, preventing it from committing to a swift attack. The confusion occurs within the critical tens of milliseconds when the predator makes its final, decisive move, rendering it unable to adjust its course at the last moment.\n\nScientists have been captivated by butterfly wings since their initial documentation in 1938. In 2021, researchers at MIT managed to capture, for the first time ever, the continuous structural growth of butterfly wings as the insects develop inside their chrysalises. The unique structural coloration of butterfly wings is a result of photonic crystals, which are found in the chitin scales covering the wings. Unlike pigment molecules, which produce a broad spectrum of colors, photonic crystals create specific colors or wavelengths, akin to a diffraction grating. However, unlike a diffraction grating that reflects a wide range of colors, photonic crystals generate only particular colors, resulting in the iridescent hues observed in butterfly wings.",
  "summary": "Wing patterns, flight dynamics create \"motion dazzle\" effect, make it harder to gauge speed, direction.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 2,
    "also_reported_by": [
      {
        "outlet": "Ars Technica Science",
        "title": "What butterfly wings have in common with barbershop poles",
        "url": "https://urgent.news/2026/09/30/what-butterfly-wings-have-in-common-with-barbershop-poles-11008253",
        "published": "2026-09-30T15:00:56.000Z"
      }
    ]
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}