But a physical button has a shape or appearance that makes it look like something to push. It's learnable.
The author is making the point that Metro has zero visual clues, it's not learnable. You don't know which tiles you can interact with until you try and interact with them.
>But a physical button has a shape or appearance that makes it look like something to push. It's learnable.
And there are also plenty of things that looked like buttons when I was little, that I thought you could push. But you couldn't. I don't really buy this argument.
The author is making the point that Metro has zero visual clues, it's not learnable. You don't know which tiles you can interact with until you try and interact with them.