I am very curious as to why the etched lines running between components on a printed circuit board run the indirect paths they do. Looking at one now, I notice that many of the etched lines connecting components make all sorts of turns as if they were navigating around something...but nothing is there. Why aren't they just going in more direct paths, only turning to navigate around other components? The pattern of etched lines in circuit boards are basically an iconic image of electronics technology, but I'd love to know why these patterns are the way they are. Thank you.