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  2. Ebbinghaus illusion - Wikipedia

    en.wikipedia.org/wiki/Ebbinghaus_illusion

    The Ebbinghaus illusion or Titchener circles is an optical illusion of relative size perception. Named for its discoverer, the German psychologist Hermann Ebbinghaus (1850–1909), the illusion was popularized in the English-speaking world by Edward B. Titchener in a 1901 textbook of experimental psychology, hence its alternative name. [ 1 ]

  3. Depth perception - Wikipedia

    en.wikipedia.org/wiki/Depth_perception

    Perspective, relative size, occultation and texture gradients all contribute to the three-dimensional appearance of this photo. Depth perception is the ability to perceive distance to objects in the world using the visual system and visual perception. It is a major factor in perceiving the world in three dimensions.

  4. Delboeuf illusion - Wikipedia

    en.wikipedia.org/wiki/Delboeuf_illusion

    Though the two circled dark discs are the same size, the left disc seems smaller than the right one. The Delboeuf illusion is an optical illusion of relative size perception: In the best-known version of the illusion, two discs of identical size have been placed near to each other and one is surrounded by a ring; the surrounded disc then appears larger than the non-surrounded disc if the ring ...

  5. Perceived visual angle - Wikipedia

    en.wikipedia.org/wiki/Perceived_visual_angle

    Angular size illusions are most obvious as relative angular size illusions, in which two objects that subtend the same visual angle appear to have different angular sizes; it is as if their equal-sized images on the retina were of different sizes. Angular size illusions are contrasted with linear size illusions, in which two objects that are ...

  6. Moon illusion - Wikipedia

    en.wikipedia.org/wiki/Moon_illusion

    Photographs of the Moon at different elevations also show that its size remains the same. A simple way of demonstrating that the effect is an illusion is to hold a small pebble (say, 0.33 inches or 8.4 millimetres wide) at arm's length (25 inches or 64 centimetres) with one eye closed, positioning the pebble so that it covers (eclipses) the ...

  7. Tiny Lion Cubs Get Very First Vet Exam at Fresno Zoo ... - AOL

    www.aol.com/lifestyle/tiny-lion-cubs-very-first...

    As the video from the zoo explains, the cubs' mama, Zamaya, wouldn't let anyone near them for the first couple of weeks. But don't worry, that's totally normal! But don't worry, that's totally normal!

  8. Your Body Never Forgets Muscle. So Here's How Long It ... - AOL

    www.aol.com/body-never-forgets-muscle-heres...

    Learn how muscle memory works, how long it takes to develop, and why it’s crucial for fitness. Plus, tips to train smarter and build strength and muscle faster.

  9. Size - Wikipedia

    en.wikipedia.org/wiki/Size

    Size in general is the magnitude or dimensions of a thing. More specifically, geometrical size (or spatial size) can refer to three geometrical measures: length, area, or volume. Length can be generalized to other linear dimensions (width, height, diameter, perimeter). Size can also be measured in terms of mass, especially when assuming a ...