I did cut the slide out of its context in the talk
When we say “programming language”, we aren’t identifying a category of things defined by some rules, but a cluster of things that are accepted as having enough programming-language-ness to qualify
3
We went through C, UML, Scratch, knitting patterns, spreadsheets, HTML and had a show of hands in the room that gave an interesting gradient of results
I recommend the talk, it was very good, and then skip the first question because it was very bad