Use wire cutters to cut the long, straight section of wire from the bottoms of two wire hangers. Cut on each side of each hanger just before the wire starts to curve. Use pliers to make a small loop in each end of each piece of wire.
Bend one of the pieces of wire so that there is a loop in it's center large enough to fit the other wire through. Thread one wire through the loop in the other. Use the pliers to bend the straight wire so that there is a loop in its center that intertwines with the first wire's loop. The wires should cross in the center, making an x shape, connected by two loops in the center, with each arm the same length.
Make two more wire x shapes using four more wire hangers.
Find objects to hang from 10 of the 12 arms of the three shapes. Consider the objects size and weight, and how you will attach string to them. Relate the items to a school project, such as using cutouts to represent the flora and fauna of a region to correlate with a geography unit. Mold clay around the string and then into geometric shapes to correlate with a math unit on geometry. Students might also choose items that relate to a book they have read for a class.
Use string to connect the objects to the mobile. String may be glued to pieces of paper, taped or stapled to objects, or tied around objects that have holes or hooks. Hang objects from all four arms of two of the mobiles and two opposite arms of the third, always balancing the objects. The two mobiles that have objects on all four arms should kept as close as possible to the same weight.
Tie a hanging string to the center of the loops in the mobile with objects on two arms. To check for balance, hold the mobile by the string. If the two arms that have objects on them don't balance, add or remove weight so that they do. Attach the two mobiles with four objects to the two free arms on the other one, using string from the center loop of one to the loop on the free arm of the other. Check for balance again and make necessary adjustments.