Related. Others?

Simplified Piet interpreter written in Python - https://news.ycombinator.com/item?id=33130954 - Oct 2022 (2 comments)

Piet, a programming language in which programs look like abstract paintings - https://news.ycombinator.com/item?id=21913483 - Dec 2019 (19 comments)

Piet – A programming language in which programs look like abstract paintings - https://news.ycombinator.com/item?id=13503841 - Jan 2017 (12 comments)

Sample programs in the Piet programming language - https://news.ycombinator.com/item?id=11342442 - March 2016 (27 comments)

Piet – visual programming language - https://news.ycombinator.com/item?id=11266653 - March 2016 (1 comment)

Piet Program Gallery - https://news.ycombinator.com/item?id=7727702 - May 2014 (4 comments)

Enterprise Piet - https://news.ycombinator.com/item?id=4698737 - Oct 2012 (39 comments)

Piet: programming with pixels - https://news.ycombinator.com/item?id=2430357 - April 2011 (3 comments)

Piet is a programming language, whose programs look like abstract art. - https://news.ycombinator.com/item?id=1166462 - March 2010 (28 comments)

Piet: a programming language in which programs look like abstract paintings - https://news.ycombinator.com/item?id=235975 - July 2008 (1 comment)

And you thought BrainFk was hard to understand... - https://news.ycombinator.com/item?id=139872 - March 2008 (2 comments)

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Bonus:

Mondrian painting has been hanging upside down for 75 years - https://news.ycombinator.com/item?id=33370228 - Oct 2022 (71 comments)