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Pencil_in_a_bowl_of_water.png: User:Theresa_knott derivative work: Gregors ( talk ) 10:51, 23 February 2011 (UTC) This is a retouched picture , which means that it has been digitally altered from its original version.
A pencil or another rigid straight line can appear as bending like flexible rubber when it is wiggled fast enough between fingers, or otherwise undergoing rigid motion. Persistence of vision has been discarded as sole cause of the illusion. It is thought that the eye movements of the observer fail to track the motions of features of the object ...
Looking at a straight object, such as a pencil in the figure here, which is placed at a slant, partially in the water, the object appears to bend at the water's surface. This is due to the bending of light rays as they move from the water to the air. Once the rays reach the eye, the eye traces them back as straight lines (lines of sight).
The missing square puzzle is an optical illusion used in mathematics classes to help students reason about geometrical figures; or rather to teach them not to reason using figures, but to use only textual descriptions and the axioms of geometry. It depicts two arrangements made of similar shapes in slightly different configurations.
Such "self-bending" spoons will bend themselves when used to stir tea, coffee, or any other warm liquid, or even when warmed by body heat. [citation needed] Simply holding a spoon by its neck and rapidly whirling it back and forth can also create the illusion that the spoon is bending, due to the way that the human eye perceives the rocking motion.
The widely accepted interpretation of, e.g. the Poggendorff and Hering illusions as manifestation of expansion of acute angles at line intersections, is an example of successful implementation of a "bottom-up," physiological explanation of a geometrical–optical illusion. Ponzo illusion in a purely schematic form and, below, with perspective clues
Beyond walking at a brisk pace, a key part of power walking is bending and swinging your arms to propel yourself forward and keeping your core engaged. “It should really be a full-body exercise ...
Databending (or data bending) is the process of manipulating a media file of a certain format, using software designed to edit files of another format. Distortions in the medium typically occur as a result, and the process is frequently employed in glitch art .