Implementing this policy led to the economic expansion and population growth. The Han Dynasty developed many important inventions including, paper, the sundial, the wheelbarrow, the stern-mounted steering rudder, and the seismograph. The papermaking process allowed for cheap and easy production of paper. Without the invention of paper, many ideas and discoveries would have been lost. This is because paper allowed people to record our thoughts and ideas with ease, compared to the old process of stone tablets. Papermaking was traced back to China when Cai Lun created a sheet using mulberry, fishnet, old rags and hemp waste. The creation of the sundial allowed for man to tell time based off of the positioning of the sun, and it stands as more than just a garden ornament: the sundial is the basis for the modern-day clock. Sundials had a rod in the middle that casted a shadow that would move as the sun moved across the sky, because sundials tell the solar time within each local area it was not a uniform