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Those thing give UI something called affordance http://en.wikipedia.org/wiki/Affordance

It's pretty much the modern equivalent of the argument for always underlining links to communicate that it can be clicked.

Dustin Curtis's flat approach to buttons and links is to use rounded borders: http://svbtle.com. This will probably be how buttons will - and should - work in a flat design.

On the underline thing. While its not a need to have, it helps me recognize links without thinking.

It's always a great rule of thumb. Especially with touch devices that obviate :hover-based signalling.

> Dustin Curtis's flat approach to buttons and links is to use rounded borders: http://svbtle.com

Of course, they're so dim that I can barely see them at all... ><

Related word: "acutance"

http://en.wikipedia.org/wiki/Acutance

That word is worth knowing. Thank you.

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