I'm fascinated to see Steve Losh demonstrating a 'gather' macro in Common Lisp, removing boilerplate for an accumulator: https://stevelosh.com/blog/2018/05/fun-with-macros-gathering/
Most use of yield in Python seems to be focused on gathering rather than lazy evaluation, but I never had a name for the concept!
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Steve Jobs famously asked for smooth scrolling (i.e. not line-by-line) in a Smalltalk demonstration and they changed the UI live.
Here's a lovely 2 minute YouTube video demonstrating that modification: https://www.youtube.com/watch?v=eEz08IlcNMg
This is my favourite genre of web design: simultaneously advocating for a style and demonstrating why you should/shouldn't use it!
Wonderful Strange Loop talk demonstrating Comby, a very simple parser with an elegant pattern language for large scale refactoring.
https://youtu.be/JMZLBB_BFNg