The Poggendorff illusion is a visual illusion that was first discovered in 1860 by the German physicist Johann Poggendorff. This illusion occurs when a diagonal line is interrupted by a vertical line, causing the diagonal line to appear misaligned. The reason for this illusion is that the visual system tends to interpret the diagonal and vertical lines as belonging to the same plane, even though they are actually on different planes. As a result, the visual system assumes that the diagonal line must continue behind the vertical line, causing the misalignment. The Poggendorff illusion provides an example of how our perception can be influenced by context and expectations. It has been used extensively to study visual perception and cognitive processing.
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