Almost all mobile cameras now produce 4x3 images (since the optical system has a round lens, I do wonder why it is not 1x1. Any ideas?), and almost all mobile screens are now 16x9, how do you display the images on a phone? Here are the "natural" ways to put 1, 2, 3, 4, 6 4x3 images on the 16x9 screen (5 there is no "pretty" way). After 6, things get too small IMO.
|1,2,3,4,6 4x3 rectangles on a 16x9 screen|