Mary has a ball of string that she ties around a finger. - she throws the ball to the person who is sitting four spaces away. - this person wraps the string around their finger. - the same pass movement continues until mary receives it again. what shape has been traced out? what other shapes can be traced out if the pass rule changes? how many different shapes can be traced for 12 people? how many different shapes can be traced for 10 people? explore the number of shapes that can be made by using different pass rules for varying numbers of people.