How Lisp changed my style

This is the first post in the series of How <x> changed my style where I shall talk about tools and events that had a significant impact on my style of doing things. If you happen to like this idea, I would be very happy if you could help it spread like wildfire, because it's a form of pay-it-forward where we say Thanks for cool stuff.

Some months ago, fuck has it been two? three? four?,