After downloading this image from flickr I rotated it slightly, converted it to black and white, and adjusted contrast. I very much doubt that these changes are copyrightable, but just in case, I release any copyright claim I might have into the public domain.

本文件采用知识共享署名 2.0 通用许可协议授权。

您可以自由地：

• 共享 – 复制、发行并传播本作品
• 修改 – 改编作品

惟须遵守下列条件：

• 署名 – 您必须对作品进行署名，提供授权条款的链接，并说明是否对原始内容进行了更改。您可以用任何合理的方式来署名，但不得以任何方式表明许可人认可您或您的使用。

https://creativecommons.org/licenses/by/2.0CC BY 2.0 Creative Commons Attribution 2.0 truetrue

This image, originally posted to Flickr, was reviewed on 13 April 2007 by the administrator or reviewer Davepape, who confirmed that it was available on Flickr under the stated license on that date.