File:Grey square optical illusion.PNG

預覽大細：772 × 599 像素。第啲解像度：309 × 240 像素｜618 × 480 像素｜989 × 768 像素｜1,087 × 844 像素。

原本檔案 ‎（1,087 × 844 像素，檔案大細：143 KB ，MIME類型：image/png）

呢個檔案係出自維基同享。下面係佢喺嗰邊嘅描述。
Commons 收集自由嘅媒體檔案。你可以去幫手。


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File:Grey square optical illusion.PNG → File:Checker shadow illusion.svg

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摘要

描述

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

日期

Original in 1995, this file in January 2004

來源

File created by Adrian Pingstone, based on the original created by Edward H. Adelson

作者

Original by Edward H. Adelson, this file by Gustavb

許可
(重用呢個檔案)

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檔案歷史

撳個日期／時間去睇響嗰個時間出現過嘅檔案。

	日期／時間	尺寸	用戶	註解
現時	2016年5月24號 (二) 10:20	1,087 × 844（143 KB）	Avayak	optimized losslessly
	2008年1月13號 (日) 21:13	1,087 × 844（159 KB）	Mahahahaneapneap	pngcrushed
	2007年4月24號 (二) 03:54	1,087 × 844（214 KB）	Jrockley	much larger version
	2007年4月9號 (一) 00:41	522 × 408（70 KB）	Jrockley	Prepared 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