(Nods...)   And a person skilled in joinery can cut the piece with exactly an appropriate amount of selvage wood (so as not to unnecessarily waste wood on the stock piece), and can execute the finer-and-finer cuts until he arrives exactly at a joint that’s stronger than any nail.   What looks like trial-and-error, though, is anything but that.

BTW:   I know that I am not “preaching and teaching” here ... not to this esteemed community of developers, some of whom are responsible for some of the most-astonishing software I have ever seen (and know that I will never match).   I am ... meditating.   Thinking about the process.   That’s all.   That’s all.