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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 ...
In the silent film days, live music always accompanied movies, and movies were events. "Over the years, theaters got smaller," said Steve Linder. "Then, people started watching it on their television.
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 ...
The intent is to allow the user to start and stop the display without the distraction of continual play. Some observers initially see the figure as spinning clockwise, and others see it spinning anticlockwise. And often, by changing one's focus, one can "cause" the figure to appear to change its direction of spin.
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Well, its status as an important optical illusion is an issue to be discussed in the optical illusion article or in an AfD for The Spinning Dancer. But it is quite relevant in its own article. Being nothing special is another story. gren グレン 07:28, 13 February 2008 (UTC) Every picture in every article is "relevant".
One illusion of Kitaoka's in particular involving a photo of strawberries became a viral sensation recently. But we've found another one of his images that has left tweeters befuddled.
Claudet also noted in 1867 that the thaumatrope could create a three-dimensional illusion. A spinning rectangular thaumatrope with the alternating letters of the name "Victoria" on each side, showed the full word with the letters at two different distances from the observer's eye. If the two strings of the thaumatrope are attached to the same ...