The display measures in at four inches, the same as the current iPhone 5, but that is where the similarities pretty much grind to a halt. There’s a see-through display – something many Apple fans have (somewhat bemusingly) alluded to in concept designs of times passed – but on this particular design, I think it does enhance the overall elegance of the device. As well as, of course, looking great, the transparency could also have many practical uses, particularly in the field of navigation, exploration and augmented reality in general