Poggendorff Illusion
Poggendorff Illusion
Can your eyes deceive you? Adjust the position of the upper red line until you think it is aligned with the lower red line. Then check your selection by removing the rectangle.
External Links
External Links
Permanent Citation
Permanent Citation
Sándor Kabai
"Poggendorff Illusion"
http://demonstrations.wolfram.com/PoggendorffIllusion/
Wolfram Demonstrations Project
Published: August 15, 2008