I think, rather than arranging it in specific pattern they tried to fit 16 camera modules as close as possible so as to reduce overall size. As the modules are

I think, rather than arranging it in specific pattern they tried to fit 16 camera modules as close as possible so as to reduce overall size. As the modules are of different sizes, resulting placement looks irregular. Please refer video 'The Story of light' on page https://light.co/camera https://light.co/camera @1:25 , wireframe of all modules is displayed.