The international Standard paper sizes, called the A series, is based on a golden rectangle, the divine proportion. It is extremely handsome and practical as well. It is adopted by many countries around the world and is based on the German DIN metric Standards. The United States uses a basic letter size (8 1/2 x 11”) of ugly proportions, and results in complete chaos with an endless amount of paper sizes. It is a by-product of the culture of free enterprise, competition and waste. Just another example of themisinterpretations of freedom.
The A4 is the basic size for stationary. Two thirds of it is a square, a nice economical happenstance resulting from the golden rectangle. It is one of the reasons we tend to use as much as possible the DIN sizes: proportions are always leading to other nice proportions. This does not happen with the American basic size which leads to nothing. I counted 28 different standard sizes in USA!. The only reason we use it is because everybody in USA uses it, all stationary in USA is that size, so are manilla folders, files and office equipment! The repercussion of ugliness is endless.