In our research lab. we are carrying out an experiment on nonverbal communication, using spontaneous drawing. Participants are asked to communicate with each other, not by language but by free drawing.
It's interesting to observe how the drawing process unfolds, of course, but what is more interesting is to know how two bodies interact with each other through nonverbal signals: facial expressions and eye gaze, hand movements, postural changes, etc. Bodies are silent but talkative.
I've edited a sample movie of a trial run. Please have a look at it.