martes, 29 de septiembre de 2009

Thatcher effect






"The Thatcher effect or Thatcher illusion is a phenomenon where it becomes difficult to detect local feature changes in an upside down face, despite identical changes being obvious in an upright face. It is named after British former Prime Minister Margaret Thatcher on whose photograph the effect has been most famously demonstrated. This was originally created by Peter Thompson, who is a professor at the University of York, England (Thompson, 1980). " (Read more on Wikipedia)


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