Body language/Essay questions

Relative Position
When studying body language, we learn that our position and its relativity to others around you can indicate a number social preferences.

For instance, when talking ‘one on one’ with someone, the position of your legs and their direction in relation to the person you're speaking to can suggest whether you wish to continue conversation.

When in a group situation, the very same set of observations (position of the legs), can suggest which person you most desire to interact with.

What else is there to learn or observe, which other parts of the body can we collect this type of information from?