Sometimes I miss the days of writing software by hand, back when writing software didn't cost anything. It still doesn't, of course, as it is just text, but doing so by hand is no longer economically viable and so it's more and more reduced to just hobbyist use. I now have other, bigger, more complex problems to solve, which is fun in new ways, but there was something magical about handwriting systems and intimately knowing how every detail of it worked.