Comment by wtallis

> it is reasonable to assume that the point here is that a full-screen, unfolded image would scale exactly to a half-screen/folded image with no change in aspect ratio.

Sure, but aside from being interesting from a mathematical standpoint, there are no practical implications from that fact. When the user unfolds the phone and rotates it by 90 degrees, the fact that they're left with about the same aspect ratio (modulo whatever changes with status bars, etc.) means very little for UI design in light of the much more important fact that the screen doubled in size and thus the application's layout should be using the extra screen space to show more information, and should not assume that a majority of the screen is easily reachable by a thumb.