This is a file from the Wikimedia Commons

File:Grey square optical illusion.PNG

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Original file(1,087 × 844 pixels, file size: 143 KB, MIME type: image/png)

Summary[edit]

Description

An optical illusion. Square A is exactly the same shade of grey as square B. See demonstration.

Date Original in 1995, this file in January 2004
Source File created by Adrian Pingstone, based on the original created by Edward H. Adelson
Author Original by Edward H. Adelson, this file by Gustavb
Permission
(Reusing this file)
Green copyright.svg The copyright holder of this work allows anyone to use it for any purpose including unrestricted redistribution, commercial use, and modification.

Dialog-warning.svg Please check the source to verify that this is correct. In particular, note that publication on the Internet, like publication by any other means, does not in itself imply permission to redistribute. Files without valid permission should be tagged with {{subst:npd}}.

Usage notes:
• If the work requires attribution, use {{Attribution}} instead
• If this is your own work, please use {{Cc-zero}} instead

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current10:20, 24 May 2016Thumbnail for version as of 10:20, 24 May 20161,087 × 844 (143 KB)Avayakoptimized losslessly
21:13, 13 January 2008Thumbnail for version as of 21:13, 13 January 20081,087 × 844 (159 KB)Mahahahaneapneappngcrushed
03:54, 24 April 2007Thumbnail for version as of 03:54, 24 April 20071,087 × 844 (214 KB)Jrockleymuch larger version
00:41, 9 April 2007Thumbnail for version as of 00:41, 9 April 2007522 × 408 (70 KB)JrockleyPrepared for Wikipedia by Adrian Pingstone in January 2004, based on the [http://web.mit.edu/persci/people/adelson/checkershadow_illusion.html original] created by Edward H. Adelson. See also [http://en.wikipedia.org/wiki/Same_color

Global file usage

The following other wikis use this file:

View more global usage of this file.