Beautiful! One more thing to add re A4 vs letter size: A4 is also a better approximation of the 'golden ratio', so supposedly more aesthetically pleasing (thoug

Beautiful! One more thing to add re A4 vs letter size: A4 is also a better approximation of the 'golden ratio', so supposedly more aesthetically pleasing (though neither is a particularly good approximation, which shouldn't surprise since A4 is an approximation of sqrt(2) not (1+sqrt(5))/2).