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I finally got the new version of Twitter yesterday, and it looks great. And that's no accident: according to the designer, the layout of the new Twitter interface is based on the Golden Spiral:

You can describe the Golden Spiral by laying consecutive squares in a spiral fashion, each square being smaller than the last by a factor of the Golden Ratio, (1+sqrt(5))/2 or approximately 1.618. As a ratio of a length to a width, the Golden Ratio has been known by artists for millenia as an aesthetically pleasing aspect ratio for rectangular features in works of art (such as the dimensions of a painting). It's also known to mathematicians and statisticians as the number to which ratios of successive members of the Fibonacci sequence converge.

In a classic case of using a sledgehammer to crack a walnut, I created a custom iterator in R to represent the Fibonacci sequence (code after the fold) and verified the ratio converges to the Golden Ratio at the R command line: