Piet: Programming language in which programs look like abstract paintings (2002) - https://news.ycombinator.com/item?id=40141777 https://www.dangermouse.net/esoteric/piet.html

In the sample programs there's a big red one... https://www.dangermouse.net/esoteric/piet/samples.html

There's also the IOCCC classic https://www.ioccc.org/1988/westley/index.html