The Usability Post
Thoughts on design and user experience by Dmitry Fadeyev

The Function of Rounded Corners

Igor Asselbergs of Livelygrey has written a very interesting post about rounded corners a while back – I haven’t read this sort of thing anywhere else so I just have to reblog it. What’s the function of rounded corners? We use them simply to add a bit of eye-candy and improve the overall aesthetic of our websites and applications, right?

Well, there is actually more to rounded corners than just appealing looks. Here’s an example Igor used to illustrate his point:

Rounded corners set the limits of a content box or application window – they define its edges. You can clearly see the left box with rounded corners is one box that’s divided by a line running through it. The box on the right is different. It could be a box divided by a line, or it could be two rectangles next to each other. It’s not clear where the edges of the box are because its corners are not defined.

There are many straight corners, but there are only four rounded ones. Rounded corners are not simply eye-candy, they’re a tool you can use to better define content boxes or application windows. I guess it doesn’t even have to be rounded corners – any pattern or shape that breaks the flow of straight edges would set the corners of a box, but rounded corners are probably the simplest and cleanest approach.

“For even falsehood, uttered by the tongue of man, seemed like truth and light before this hopelessly-deaf and unresponsive silence.”

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Further Reading

Proust wrote that the true voyage of discovery is not to visit strange lands, but to possess other eyes, to behold a hundred universes that each of them beholds. Thus, in the words of Ruskin, what good books give us is not mere knowledge, but sight.

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