Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su SungEven from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung Even from the prehistorical period, people were interested in tracking the time. There are some evidence that the most complicated water clock was invented in 11th century by Su Sung