File:Grey square optical illusion.PNG

This image was previously a featured picture, but community consensus determined that it no longer meets our featured-picture criteria. If you have a high-quality image that you believe meets the criteria, be sure to upload it, using the proper free-license tag, then add it to a relevant article and nominate it.

This image was selected as picture of the day on the English Wikipedia for November 5, 2004, February 19, 2005, and December 16, 2005.