My idea comes from an advertisement of McDonald. The scene in the ad is that a baby on the swing smiles when he sees the sign of McDonald out of the window and cries when the sign disappear from his view. I apply a similar idea in my design.
I’ve made a simple swing using the steel wire from the meal box of Little Asia. A servo motor is provided to make the swing work. A little paper baby is placed on the swing. His eyes will blink when the swing is near the candy, which means he is happy.