File:Ascending and Descending.jpg

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This image represents a two-dimensional work of art, such as a drawing, painting, print, or similar creation. The copyright for this image is likely owned by either the artist who created it, the individual who commissioned the work, or their legal heirs. It is believed that the use of low-resolution images of artworks:

for purposes of critical commentary on:
- the specific work in question,
- the artistic genre or technique employed in the artwork, or
- the artistic school or tradition to which the artist is associated,
as applied within the English-language Wikipedia, hosted on servers located in the United States by the non-profit Wikimedia Foundation,

qualifies as fair use under United States copyright law.

Any other use of this image, whether on Wikipedia or elsewhere, could potentially constitute a copyright infringement. For further information, please refer to Wikipedia's guidelines on non-free content.
Fair use

Non-free media information and use rationale true for Ascending and Descending
Description	Ascending and Descending, by M. C. Escher. Lithograph, 1960.
Source	Official M. C. Escher website
Article	Ascending and Descending
Portion used	It represents the complete work.
Low resolution?	It is a low-resolution image.
Purpose of use	It illustrates an educational article about the lithograph print that this image represents.
Replaceable?	It is not replaceable with an uncopyrighted or freely copyrighted image of comparable educational value.
Fair useFair use of copyrighted material in the context of Ascending and Descending//en.wikipedia.org/wiki/File:Ascending_and_Descending.jpgtrue

Non-free media information and use rationale true for Penrose stairs
Description	Ascending and Descending, by M. C. Escher. Lithograph, 1960.
Source	Official M. C. Escher website
Article	Penrose stairs
Portion used	It represents the complete work.
Low resolution?	It is a low-resolution image.
Purpose of use	The lithograph is uniquely connected to the article, as (1) the Penrose's discovery of the Penrose stairs was triggered by seeing Escher's earlier work, (2) in turn Escher's creation of Ascending and descending was triggered by seeing the Penrose stairs, and (3) Escher presented the lithograph to Penrose in gratitude. The image both illustrates this remarkable dialogue of mathematics and art, and shows that the lithograph embodies Penrose stairs in its construction.
Replaceable?	No copyright-free image of the lithograph exists.
Fair useFair use of copyrighted material in the context of Penrose stairs//en.wikipedia.org/wiki/File:Ascending_and_Descending.jpgtrue

File history

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	07:33, 10 September 2009		275 × 363 (24 KB)	Pais (talk \| contribs)	low resolution

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