A cool book written by Jack Vance.
The story is about a guy named Ghyl, who grows up in a closed, regulated society.
The author narrates the story of Emphyrio's youth, his growing up, and him becoming more and more dissatisfied with the world he lives in. He breaks loose from all that by stealing a spaceship and escaping from his planet -- and learns more about the true meanings of the society he escaped from.
Also the nickname of rvdm (person).