Desktop background

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Since possibly around 2011 or 2012, I’ve used the same image as my computer desktop background. I found the image on the website of the Set Theory Group at Kobe University. The website went down sometime between December 31, 2015 (the last day on which I successfully visited the page) and April 13, 2016 (the first snapshot on the Internet Archive for which the “Access Denied” message is shown). The last archive can be found on the Internet Archive.