This is an excellent exercise for developing teamwork. First obtain a long bamboo cane or other long, light, small-diameter pole for each group. Line the groups up so that people face each other, then ask one side to take a step sideways to the left so that their eyes are in line with the gap between the shoulders of two opposite participants. Ask them all to put out their hands palm up and at the same height (about elbow height). When all people have their palms out and lined up, place the cane along their hands. Let them know that they should keep their hands in contact with the cane, but they shouldn't grasp it. Now ask them to lower the cane down to the ground. The cane always rises. Repeat the exercise until they can achieve the task.