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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 ...
English: This is a conversion & extension the "Spinning Dancer.gif file" with 34 frames & 1 second of play time to the OVG format with 2040 frames and 60 seconds of play time. The intent is to allow the user to start and stop the display without the distraction of continual play.
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 device was invented by the researcher Dr. Christine Veras, and it won third place in the Best Illusion of the Year Contest, paying homage to the classical zoetrope but displaying a unique combination of optical illusions. [56] A digital successor to the zoetrope was invented in 2023 by Mike Ando.
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Rowett has presented videos on the YouTube channel Grand Illusions since 2008. In each video, he light heartedly demonstrates and reacts to at least one toy, puzzle, or optical illusion which is either part of his collection or will be stocked through an online toy store, run as part of the Grand Illusions brand (to which he is a director).
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 side of the card the thickness of the card accounts for a small difference in the distances ...
Op art, short for optical art, is a style of visual art that uses optical illusions. [1] Op artworks are abstract, with many better-known pieces created in black and white. Typically, they give the viewer the impression of movement, hidden images, flashing and vibrating patterns, or swelling or warping.