Just realized that the iPhone Air design of putting all the hardware (save battery and screen) in a single block module suggests that an iPhone foldable will probably have a chin (or forehead?) so that, when open, it won't be a rectangle but, instead, have a block (a reverse notch) along the bottom of one half of the unfolded screen. This would allow it to be incredibly thin when folded (because the leaves would just be screen - maybe even no battery in the leaf - only in the block?). And still very thin when folded.
Or maybe the block module will be lengthwise in the spine?
