The iPhone Duo’s odd shape actually has a very cool name

Macworld The upcoming iPhone Duo’s form has widely been referred to as a having a “similar size to a passport,” comparing it to an object most people are familiar with. But an article by British GQ last week points out that the shape is based on the A-size paper format that’s used internationally. A Macworld Podcast listener provides some specifics: I wanted to comment on the aspect ratio of the Duo’s outer and inner screens – both about 1.4 : 1. As an ex-graphic designer, this ratio (known as the silver ratio, 1 to the square root of 2) is very well known to me. That is because in the UK and Europe all our paper sizes are based on this ratio.  A4 is 297 x 210mm which when folded exactly in half results in A5, which has the same ratio. This continues with smaller sizes of A6, etc. Going the other way, A3 is double A4, etc, until you get to A0, which has a surface area of 1 metre squared. Neat eh?  The iPhone Duo therefore is like an A5