Journal article Open Access

Antigravity Hills are Visual Illusions

Bressan, Paola; Garlaschelli, Luigi; Barracano, Monica


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  <identifier identifierType="URL">https://zenodo.org/record/1006741</identifier>
  <creators>
    <creator>
      <creatorName>Bressan, Paola</creatorName>
      <givenName>Paola</givenName>
      <familyName>Bressan</familyName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0003-2763-0902</nameIdentifier>
    </creator>
    <creator>
      <creatorName>Garlaschelli, Luigi</creatorName>
      <givenName>Luigi</givenName>
      <familyName>Garlaschelli</familyName>
    </creator>
    <creator>
      <creatorName>Barracano, Monica</creatorName>
      <givenName>Monica</givenName>
      <familyName>Barracano</familyName>
    </creator>
  </creators>
  <titles>
    <title>Antigravity Hills are Visual Illusions</title>
  </titles>
  <publisher>Zenodo</publisher>
  <publicationYear>2003</publicationYear>
  <dates>
    <date dateType="Issued">2003-09-01</date>
  </dates>
  <language>en</language>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/1006741</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1111/1467-9280.02451</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="http://creativecommons.org/licenses/by/4.0/legalcode">Creative Commons Attribution 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;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.&lt;/p&gt;</description>
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