The clepsydra, Rokoku, was introduced by Emperor Tenji as part of his broader efforts to enhance governance and administrative efficiency in Japan. The device, a water clock, offered a more reliable means of timekeeping compared to the sundials previously used, especially during the cloudy days when sunlight was insufficient. The placing of the Rokoku in the capital city of Ōtsu symbolized its importance in daily civic life and the management of state functions. This innovative timekeeping device was an improvement that not only reflected the technological advancements of the time but also demonstrated a growing understanding of the influence of precise timekeeping on societal organization.

The introduction of the Rokoku marked a pivotal moment in the history of Japanese innovation. It showed that the Japanese court was actively engaged in scientific developments and was moving towards a more structured approach to time management, essential for the administration of the growing state. The water clock was meticulously designed to ensure accurate time measurement, which was crucial for planning agricultural activities, religious ceremonies, and court events. Emperor Tenji's attention to such devices illustrated a significant shift in governance, emphasizing the need for precision in ruling and in the lives of citizens.

The introduction of this technology was not merely a functional achievement; it represented a cultural shift. The Rokoku served not only as a practical tool but also as a piece of art, symbolizing the ingenuity and aspirations of the era. As the device became an integral part of life in Ōtsu, it contributed to the establishment of a more organized society, where time management became essential for both administration and daily activities. The influence of the clepsydra extended well beyond its immediate utility, marking a turning point in Japan's historical trajectory towards modern civilization.