What is the most beautiful code you've ever seen?

donald knuth introduced the "literal programming". This paradigm, having documentation and code in one, make the code readable like a book. Also, one needs to put more thoughts into code structure, making the code not only readable, but also "good layouted" with clear separations of documentation and the code.

Some would say this Lisp interpreter written in Lisp: https://youtu.be/OyfBQmvr2Hc

For me it's Lua. Everything from implementation to design. The perfect example of maximal orthogonality.

there was something posted on here ages ago, a web clock whose code self-altered to change what it looked like. I wish I could find it.