Journal article Open Access

Antigravity Hills are Visual Illusions

Bressan, Paola; Garlaschelli, Luigi; Barracano, Monica

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  "inLanguage": {
    "alternateName": "eng", 
    "@type": "Language", 
    "name": "English"
  "description": "<p>Antigravity hills, also known as spook hills or magnetic hills, are natural places where cars put into neutral are seen to move uphill on a slightly sloping road, apparently defying the law of gravity. We show that these effects, popularly attributed to gravitational anomalies, are in fact visual illusions. We re-created all the known types of antigravity spots in our laboratory using tabletop models; the number of visible stretches of road, their slant, and the height of the visible horizon were systematically varied in four experiments. We conclude that antigravity-hill effects follow from a misperception of the eye level relative to gravity, caused by the presence of either contextual inclines or a false horizon line.</p>", 
  "license": "", 
  "creator": [
      "@id": "", 
      "@type": "Person", 
      "name": "Bressan, Paola"
      "@type": "Person", 
      "name": "Garlaschelli, Luigi"
      "@type": "Person", 
      "name": "Barracano, Monica"
  "url": "", 
  "image": "", 
  "datePublished": "2003-09-01", 
  "headline": "Antigravity Hills are Visual Illusions", 
  "@context": "", 
  "identifier": "", 
  "@id": "", 
  "@type": "ScholarlyArticle", 
  "name": "Antigravity Hills are Visual Illusions"
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