http://fsymbols.com/cn/wenzi-yishu/
http://fsymbols.com/text-art/#all_cats
http://chris.com/ascii/index.php?art=objects/keys
http://www.pictoriano.com/
http://www.asciiartfarts.com/20140225.html
http://sunnyspot.org/asciiart/gallery/newsgoup.html
http://netforbeginners.about.com/od/weirdwebculture/f/whatis_ascii_art.htm
https://en.wikipedia.org/wiki/ASCII_art
http://blog.sina.com.cn/s/blog_6ec8a00e0100mu4y.html