Glass blowing for scientific instruments is an artisan craft and can literally be done in a shed

It is also considered an endangered craft. Some scientific instruments, if broken, cannot realistically be replaced in any reasonable time frame (or sometimes even at all).

People who take up glassblowing as a hobby are closer to being crucial to the world economy than most.

Just something to chew on.

It isn't like mind blowing or anything. But it sure is something.