Welles used an aural technique from radio called the "lightning-mix". Welles used this technique to link complex montage sequences via a series of related sounds or phrases. For example, Kane grows from a child into a young man in just two shots. As Thatcher hands eight-year-old Kane a sled and wishes him a Merry Christmas, the sequence suddenly jumps to a shot of Thatcher fifteen years later, completing the sentence he began in both the previous shot and the chronological past. Other radio techniques include using a number of voices, each saying a sentence or sometimes merely a fragment of a sentence, and splicing the dialogue together in quick succession, such as the projection room scene. The film's sound cost $16,996, but was originally budgeted at $7,288.