Communicative gestures are gestures that are produced intentionally and meaningfully by a person as a way of intensifying or modifying speech produced in the vocal tract (or with the hands in the case of sign languages), even though a speaker may not be actively aware that they are producing communicative gestures. For instance, on the picture above of Uncle Sam, he is pointing and sending a non-verbal form of gesture by implying he wants you to join the U.S. Army. This is a form of symbolic gesture, usually used in the absence of speech.