The Historical and Scientific Reasons Behind Writing Directions in World Languages

Throughout human history, the physical method of recording thoughts has evolved significantly across different cultures and languages, including Bengali and Arabic. In ancient times, before the invention of modern paper and digital screens, early humans primarily expressed their thoughts by carving directly into the hard surfaces of stones.

A major scientific reason behind the direction of ancient scripts relates to human biology and handedness. Because the vast majority of human beings are naturally right-handed, ancient artisans and stone carvers found it more physically comfortable and natural to hold their tools and carve stones moving from the right side toward the left side.

As writing technology transitioned from stone carving to inks and liquids, practical challenges emerged regarding human physiology. To actively prevent wet ink from smudging and smearing across the page as the hand moved, specific writing systems such as Greek, Latin, and scripts of the Indian subcontinent ultimately established the convention of writing from left to right.

Before settling on standardized linear formats, writing systems experimented with various directional flows. For instance, ancient Greeks practiced a distinct technique known as 'boustrophedon', where the writing direction reversed on alternate lines, mimicking the path of an ox ploughing a field.

In addition to horizontal writing layouts, different global writing traditions developed unique vertical structures. Notably, ancient Chinese and Japanese languages traditionally adopted a vertical writing format, running strictly from the top down rather than across the page horizontally.