Credits
The first image in Explanation is from Wikimedia Commons under the license Creative Commons Attribution 3.0 Unported
https://commons.wikimedia.org/wiki/File:Inner_Sunset,_San_Francisco,_CA…
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Attributed to Mickey Løgitmark
The image has not been modified.
The second image in Explanation is from Wikimedia Commons. This work is from the Carol M. Highsmith Archive collection at the Library of Congress. According to the library, there are no known copyright restrictions on the use of this work.
Carol M. Highsmith has stipulated that her photographs are in the public domain. Photographs of sculpture or other works of art may be restricted by the copyright of the artist.
https://commons.wikimedia.org/wiki/File:The_16th_Avenue_Tiled_Steps_Pro…