Lovely talk from @strangeloop_stl showing Black, a Scheme where you can recursively make changes to evaluation!
In the picture, Nada is demonstrating adding a special form (not macro!) for instrumentation. Mind bending.
miniblog.
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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