The chicken or the egg

I'm sitting around, reading a book on my computer. It's a .pdf that I'm looking at in KGhostView. I've got the whole page, that's two pages of book on one page of the .pdf, displayed on my screen. That means no scrolling, except to go to the next page. And that's what's got me thinking.

There's no button clicking. Every time I want to hit the next page, I just move my middle finger a little on my scroll wheel. Just a little, though. It's a tiny fraction of an inch, just dragging the little bit of mouse wheel that comes into contact with the very tip of the pad of my finger. Just one drag. I don't need to go back and drag again, I don't need to extend my finger to the end of the wheel and drag the whole thing. It's perfect, it's lovely, it works with minimal effort. And like most things that work well, I didn't notice it when I was doing it right. I only noticed what I was doing when I accidentally scrolled too much and skipped ahead two pages instead of one. It's like the computer/mouse/program/mouse driver is teaching me to be subtle.

That's where the question comes in. I'm trying to decide whether the way my computer asks me to do things makes me more subtle, or whether humans just are subtle and computers are designed to work with that. I can't decide whether it's teaching me, or we've taught it. For me, because I lack the insight that would give me the real answer that I'm sure exists, it's like the chicken and the egg. Is the computer subtle and teaches us to be, or are we subtle and teach computers to be? I know that I possess the ability to be subtle. I know that the computer does, too. I just don't know who's driving that subtlety.