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Optical illusion – the Adelson checkerboard shadow illusion

March 4, 2013 by chrismadden

Optical illusion - the Adelson checker shadow illusion

The Adelson checkerboard shadow optical illusion.
Which mouse is standing on the darker square – answer, neither!

The checker shadow illusion is associated with the work of Edward H. Adelson

This is how the illusion works.
An object (the elephant) on a checkerboard casts a shadow on the board.
The parts of the board in the shadow are darker than the parts of the board that aren’t.
The human brain knows that the squares on the board are all same – either white or dark gray, so it compensates for the darkening effect of the shadow, making the white squares that are in the shadow seem lighter than they really are (which can be as dark as the dark gray squares, as here).
The second image shows the mice holding a uniformly gray strip across the checkerboard to allow the tones of the squares to be compared
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  • ALL
  • COVID-19
  • ART
    ▼
    • Modern art
  • GARDENING
    ▼
    • Flower Gardening
    • Vegetable and fruit gardening
    • Garden design
    • Spring gardening
    • Summer gardening
    • Autumn gardening
    • Winter gardening
  • ENVIRONMENT
    ▼
    • Climate Change cartoons
    • Wildlife in danger
    • Pollution cartoons
    • Energy fuel power
    • Transport
    • Trees
      ▼
      • Deforestation
    • Consumerism
    • Other environment cartoons
  • SCIENCE
    ▼
    • Evolution
    • Genetics cartoons
      ▼
      • dna
    • Medical
    • Astronomy
    • Other science cartoons
  • ANIMALS
    ▼
    • Birds
    • Penguins
    • Cat cartoons
    • Insects – creepy crawlies
    • Animals (wild or pets)
  • MORE
    ▼
    • Computers, phones
    • Moon cartoons
    • Philosophy Cartoons
    • ECONOMY
      ▼
      • Euro crisis
      • Business
    • Christmas cartoons
    • Religion/Spirituality
    • Science Fiction
    • Politics
    • DOMESTIC
      ▼
      • Cooking and kitchens
      • In the home
      • Health
      • Diet
      • DIY
      • Children
    • Sociology
    • Social issues
    • Education
    • Relationships
    • Sport
      ▼
      • Olympics
  • BOOKS