DO: Begin in a circle. Your teacher will tap someone on the head, which is their signal to step into the circle, create a shape with their body then freeze. One-by-one, everyone will step into the circle and add to the shape. You must hold hands with at least one other person.
UNDO: Without letting go of hands, reverse the action. Starting with the last person who joined the circle, one-by-one everyone will return to the circle by moving slowly and carefully. This is your chain reaction.
