Part 3/6:
A4 paper adheres to a neat organization—its dimensions fit neatly within the metric system, where one A4 sheet encompasses an area of exactly one square meter. The paper can be halved repeatedly, leading to smaller formats like A5, A6, and beyond. The scalability continues down to A-45, a theoretical size large enough to wrap the entire Earth. This elegant aspect of A4 demonstrates not only its practicality but also the creativity involved in its design.