Trying to decipher body language from a single gesture is like trying to find narrative meaning in a single word.

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Users can swap between the two with a single gesture, and decide what content is deemed personal and accessible, or private and professional on the same device.

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She follows conversation, reacts, engages and offers unsolicited ideas -- usually in the form of a single word or gesture that makes clear what she means.

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That is, refrain from assuming that any single gesture has a particular meaning until you see two corroborating gestures that reinforce that same message.

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Moreover, even within a single group, the meaning of a gesture could vary with context, almost as tone of voice can vary the meaning of a human's spoken word.

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