There are a lot of interfaces that irk me, not because they’re poorly designed in general, but because they don’t interface well with my brain. In particular, they don’t interface well with the speed of brains. The best interfaces become extensions of your body. You gain the same direct control over them that you have over your fingertips, your eyes, your tongue in forming words.
This essay comes in two parts: (1) why this is an issue and (2) advice on how to make the best of what we’ve got.
One thing that characterizes your control over your body is that it (usually) has very, very good feedback. Probably a bunch of kinds you don’t even realize exists. Consider that your muscles don’t actually know anything about location, but simply exerting a pulling force. If all of the information you had were your senses of sight and touch-against-skin, and the ability to control those pulling forces, it would be really hard to control your body. But fortunately, you also have proprioception, the sense that lets you know where your body is, even if your eyes are shut and nothing is touching. For example, close your eyes and try to bring your finger to about 2cm (an inch) from your nose. It’s trivially easy.
One more example that I love and then I’ll move on. Compensatory eye movements. Focus your gaze at something at least two feet away, then bobble your head around. Tried it? Your brain has sophisticated systems (approximating calculus that most engineering students would struggle with) that move your eyes exactly opposite to your head, so that whatever you’re looking at remains in the center of your gaze and really quite incredibly stable even while you flail your head. This blew my mind when I first realized it.
The result of all of these control systems is that our bodies kind of just do what we tell them to. As I type this, I don’t have to be constantly monitoring whether my arms are exerting enough force to stay levitated above my keyboard. I just will them to be there. It’s beyond easy―it’s effortless.
Now, try willing your phone to call your friend. You’re allowed to communicate your will using your voice, your hands, whatever. Why does it take so many steps, or so much waiting?
