Why are sensors and frames rectangular? Why don't they make them square? It would eliminate the need to hold the camera sideways, and for many it could eliminate the need for grips (although I know how much people love their grips, and I'm sure people could still buy them if they wanted them). It would also eliminate the need to rotate photos (or the technology inside the camera that rotates the photo automatically). I realize that a square is not always ideal for composition, but anyone can digitally crop an image into a 3:2 either portrait or landscape. I guess part of this is a throwback to film. But couldn't we move beyond this?