Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
A version of the Poggendorff figure due to Horrell, showing that the bias is reduced or even abolished if the local angle of intersection is made into a right angle. The reader can experiment with viewing distance to determine the visual angle of the notch at which the bias is recovered.
