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The illusion derives from the lack of visual cues for depth. For instance, as the dancer's arms move from viewer's left to right, it is possible to view her arms passing between her body and the viewer (that is, in the foreground of the picture, in which case she would be circling counterclockwise on her right foot) and it is also possible to view her arms as passing behind the dancer's body ...
The dress was a viral phenomenon, which was either seen as blue and black or as white and gold. Its true colours were eventually confirmed to be blue and black. [2] Ebbinghaus illusion: The Ebbinghaus illusion, or Titchener circles, is an optical illusion of relative size perception. The two orange circles are exactly the same size; however ...
[note 1] The king calls for the girl, locks her up in a tower room filled with straw and a spinning wheel, and demands she spin the straw into gold by morning or he will have her killed. [note 2] When she has given up all hope, a little imp-like man appears in the room and spins the straw into gold in return for her necklace of glass beads. The ...
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 ...
Stroboscopic images is where a series of static images are viewed in sequence at a high enough rate that the static images appear to blend into a continuous motion. An example of this is a motion picture. Optical art (or Op art.) is when artists use simple black and white patterns that create vivid illusions of motion, which are known as ...
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White cells are larger than red blood cells and can be larger than the diameter of a capillary, so must deform to fit. As a large, deformed white blood cell goes through a capillary, a space opens up in front of it and red blood cells pile up behind. This makes the dots of light appear slightly elongated with dark tails.
A purple and black tabletop electric spinning wheel, or espinner. An electric motor in the base drives the flyer. An electric spinning wheels, or e-spinner, is powered by an electric motor rather than via a treadle. Some require mains power while others may be powered by a low-voltage source, such as a rechargeable battery.