fidgeting music

sit absolutely still with your instrument (voice, sound object, etc), directly across from a partner.
look at one another. be far enough away that you can see your partner's entire body.
notice your partner trying to sit absolutely still.
whenever you notice them move in any way (fidget, blink, etc), make a congruent sound on your instrument
(try to create your sound in a way that doesn't cause you to move very much)

option 1: when attempting to detect your partner's movement, discount any movement they make while producing their sound
option 2: include any and all of your partner's sound-making movement into your movement-detection

everyone's sounds should all be distinctly audible (i.e. don't play too soft, but also don't play too loud)