Definitely agree on lenses being one of the more mind blowing things I've encountered and eventually grokked in programming. I would also recommend https://www

Definitely agree on lenses being one of the more mind blowing things I've encountered and eventually grokked in programming. I would also recommend https://www.youtube.com/watch?v=QZy4Yml3LTY https://www.youtube.com/watch?v=QZy4Yml3LTY as a good video on lenses in part because the latter portion has some pretty far-out examples of that deep well you mentioned.