ahem.
Chapter 1
The author states there are two visible clues for construction/use of things: what parts operate and how; and how one interacts with a device. Functions = complexity. If there is too little visibility, a function will not be apparent and probably never used (more actions than controls make things difficult.) If there is too much, this is intimidating to the user.
I think Apple has a knack for natural mapping. Scroll forward = clockwise. Scroll backwards = counter clockwise, etc. Very intuitive, guys.
It is best to keep it simple. Have a strong model and make things visible.
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