Yep, the flint knapping was in my mind when I wrote my comment, that was a highly developed skill and incredibly innovative as we're other such skills and discoveries...the wheel comes to mind as well, development of bronze as a product and so much more as well. Imagine how long those things have taken to discover huh? Quite incredible.
I like simplicity and seek it I'm life, work to keep my life as uncomplicated as possible, but gonlddamm it, that's a difficult thing to do in modern society.