A Mime artist's face is from the base of the neck to the crotch. The chest is his/her eyes, te belly button is the nose and the pelvis is the smile.
Explore moving the chest through it's different plains and thinking how it makes you feel.
Work with a partner to explore this further and even add a dialogue to your movements
Walk around and put an emotion or motivation on the movement. For example walking with chest (and head) translated forward = Aggressive. Walking with head and neck translated back = reserved.
In a group of 2 to 4 people create a short scene using the chest. Each person could assume a different chest position and play the character accordingly. Or create a short scene where all 10 chest positions are visible and used.