Some of this stuff is pretty hard. Allow me to recommend something that HN readers should be able to enjoy: Flatland (http://www.gutenberg.org/ebooks/201 http:/

Some of this stuff is pretty hard. Allow me to recommend something that HN readers should be able to enjoy: Flatland (http://www.gutenberg.org/ebooks/201 http://www.gutenberg.org/ebooks/201) is a highly readable introduction to higher-dimensional spaces.