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  2. Wagon-wheel effect - Wikipedia

    en.wikipedia.org/wiki/Wagon-wheel_effect

    The wagon-wheel effect (alternatively called stagecoach-wheel effect) is an optical illusion in which a spoked wheel appears to rotate differently from its true rotation. The wheel can appear to rotate more slowly than the true rotation, it can appear stationary, or it can appear to rotate in the opposite direction from the true rotation ...

  3. Stroboscopic effect - Wikipedia

    en.wikipedia.org/wiki/Stroboscopic_effect

    Stroboscopic effect is one of the particular temporal light artefacts. In common lighting applications, the stroboscopic effect is an unwanted effect which may become visible if a person is looking at a moving or rotating object which is illuminated by a time-modulated light source.

  4. Face inversion effect - Wikipedia

    en.wikipedia.org/wiki/Face_inversion_effect

    The more familiar a particular type of face (e.g. human or dog) is, the more susceptible one is to the face inversion effect for that face. This applies to both humans and other species. For example, older chimpanzees familiar with human faces experienced the face inversion effect when viewing human faces, but the same result did not occur for ...

  5. Rotating locomotion in living systems - Wikipedia

    en.wikipedia.org/wiki/Rotating_locomotion_in...

    A wheeled buffalo figurine—probably a children's toy—from Magna Graecia in archaic Greece [1]. Several organisms are capable of rolling locomotion. However, true wheels and propellers—despite their utility in human vehicles—do not play a significant role in the movement of living things (with the exception of certain flagella, which work like corkscrews).

  6. Thatcher effect - Wikipedia

    en.wikipedia.org/wiki/Thatcher_effect

    The two upside-down images both appear superficially correct as faces. When these images are rotated, however, it becomes clear that the face on the right had its eyes and mouth inverted. The Thatcher effect or Thatcher illusion is a phenomenon where it becomes more difficult to detect local feature changes in an upside-down face, despite ...

  7. 9 misprints that are worth a ton of money. Do you have a copy?

    www.aol.com/news/2010-05-03-9-misprints-that-are...

    Penguin books in Australia recently had to reprint 7,000 copies of a now-collectible book because one of the recipes called for "salt and freshly ground black people." 9 misprints that are worth a ...

  8. Upside down goggles - Wikipedia

    en.wikipedia.org/wiki/Upside_down_goggles

    How a human looks blinking in upside down goggles. Under normal circumstances, an inverted image is formed on the retina of the eye. With the help of upside down goggles, the image on the retina of the observer's eyes is turned back (straightened) and thus the space around the observer looks upside down. [4]

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

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