For me it's the unix example in [1] "AT&T Archives: The UNIX Operating System".

    $ makewords sentences | lowercase | sort | unique | mismatch -

It reads a file called sentences then prints the words that are not spelled correctly.

To me it's; concise, expressive, flexible, modular... Which makes it beautiful...

[1] https://youtu.be/tc4ROCJYbm0