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by gjm11 1406 days ago
I think this is wrong.

A user interface needn't be all visual (e.g., in a device with physical buttons, the buttons are part of the UI).

Some visual things might not be best thought of as part of the UI (e.g., if you have a piece of software for making publication-quality graphs, and when you ask it to plot a smooth curve through some points it does a lousy job of picking the smooth curve you actually wanted, arguably that's a visual matter but it isn't really part of the user interface, it's about the algorithms underneath).