Twitter announced their new bird logo today:
Our new bird grows out of love for ornithology, design within creative constraints, and simple geometry.
It’s a beautiful logo. In the spirit of Nike, Apple, and a host of other brands that are identified simply by a shape, Twitter feels confident enough that their bird stands alone, and doesn’t require their bubble letters any more.
In a quirky twist, Upperdog has reproduced the logo using only CSS shapes. I quite like it. Hover over the logo to see the borders.