Almost every artificial aid used by man gives its user an opportunity to perform many revealing gestures and this is certainly the case with those who wear glasses. One of the most common gestures is placing one arm of the frame in the mouth (Figure 127).
Desmond Morris says that the act of putting objects against the lips or in the mouth is a momentary attempt by the person to relive the security he experienced as a baby at his mother's breast, which means that glasses-in-mouth is essentially a reassurance gesture. Smokers use their cigarettes for the same reason, and the child sucks his thumb.
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