This reminds me of another great article.
http://www.learningclojure.com/2010/09/graphics-like-its-197...
The author talks about how its harder to get graphics on the screen without installing prerequisite software than it used to be, and goes on to sing the praises of the ZX Spectrum and its concise and well written manual. He finishes the article with some fun coding experiments writing Clojure code in the spirit of the ZX.