I never understood why the boxes are shaped the way they are. Is the area proportional to importance? Why is market on the left and not the right? Why not just

I never understood why the boxes are shaped the way they are. Is the area proportional to importance? Why is market on the left and not the right? Why not just do a boring row of boxes? Or is it just arranged in a way the visual cortex finds interesting? That would add weight to the idea that this is just a meme.