You need the arm, the string, and the objects for your mobile. The objects are the 3D shapes you made and one you found around the house.
- Hang the two 3D shapes you made at either end of the arm.
- Balance the arm on your finger. Tie a string to this place on the arm. The string should hang above and below the arm.
- Hang an object from the middle string.
- Attach your mobile to something high.