File:PSM V54 D323 Two simple shapes creating optical illusions.png

Size of this preview: 800 × 391 pixels. Other resolutions: 320 × 156 pixels | 640 × 313 pixels | 1,255 × 613 pixels.

Original file (1,255 × 613 pixels, file size: 30 KB, MIME type: image/png)

This is a file from the Wikimedia Commons. Information from its description page there is shown below.
Commons is a freely licensed media file repository. You can help.

Summary

Description	English: Two simple shapes creating optical illusions
Date	1899
Source	Popular Science Monthly Volume 54 (Jastrow, Joseph: "The Mind's Eye", p.299-312)
Author	Unknown authorUnknown author

Licensing

Public domain	This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.	United States
	This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

File history

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

	Date/Time	Dimensions	User	Comment
current	04:06, 17 April 2013	1,255 × 613 (30 KB)	Ineuw	=={{int:filedesc}}== {{Information \|description={{en\|1=Two simple shapes creating optical illusions}} \|date=1899 \|source=[http://www.archive.org/details/popularsciencemo54newy Popular Science Monthly Volume 54] \|author=Unknown \|permission= \|other_versi...
	04:02, 17 April 2013	1,105 × 573 (29 KB)	Ineuw	=={{int:filedesc}}== {{Information \|description={{en\|1=Two simple shapes creating optical illusions}} \|date=1899 \|source=[http://www.archive.org/details/popularsciencemo54newy Popular Science Monthly Volume 54] \|author=Unknown \|permission= \|other_versi...
	05:52, 23 May 2011	1,284 × 573 (5 KB)	Ineuw