Marc Twain uses the technique symbolism to make the Mississippi River seem like freedom from Society. "Rivers are roads that move" this quote indicates to us that the Mississippi River is the open road for this boy Huck. The river represents freedom and easiness. "The raft was like freedom, not being' all crumpled up elsewhere," the raft had no need for restrictions of the civilized rules. The effect of using this technique is to connect the book with the reader.
Another technique used by Marc Twain