Literate Programming Alive
Programs as literature — WEB's weave-and-tangle idea that code should be written for humans first and compiled second. TeX's source is its proof of concept.
Knuth's 1984 Computer Journal paper presented WEB — a system where programs and their documentation are one source, woven into typeset exposition for humans and tangled into compilable code for machines. The program explains itself as it computes.
TeX and METAFONT were written in WEB as demonstration — Knuth's own sources remain the literate-programming canon. The idea influenced notebook interfaces (Jupyter, R Markdown) more than mainstream programming, but the principle — code is communication — is now standard dogma.