Recording a journey as discrete dated entries, one per day, forces attention onto what actually occurred that day rather than a smoothed retrospective arc. The structure captures weather, distances, delays and minor encounters that a summarizing memoir would discard, preserving texture at the cost of narrative shape.
In 1170 the poet Lu You traveled roughly 157 days by boat up the Yangtze from eastern China to take an official post in Shu (Sichuan), logging each day's progress against currents, gorges and seasonal conditions. The slow, physically contested passage upstream against the river became the organizing fact of the record, with movement measured in short daily increments.
Arriving at a site, the traveler sees it layered with the poems, histories and legends attached to it, so the physical place is experienced partly as a repository of prior writing. What is noticed and recorded is shaped by what earlier texts made famous, making observation inseparable from literary inheritance.
The diary treats geography, not the traveler's will, as the controlling variable of a journey: rapids, gorges, headwinds and low water dictate how far one moves and when one must wait. Progress is presented as something negotiated with the river rather than imposed on it.