Finding Level

A farmer and his son were working and tilling their fields. The father came upon his son, who was looking over a new section of land they had acquired. The section consisted of some low portions and some high portions. The son said to his father, "Do you want me to fill in the low areas using earth from the high ones, so that they will all be level?"

Making fun of his son, the father replied, "Why not just flood the low areas with water until it reaches the high area, as water seeks its' own level? Then the entire field will be level."

The son, becoming very serious, responded, "That won't be necessary at all. The high areas are high level. The low areas are low level."