We made this balloon by the scheme. To make the balloon rise and fall smoothly, we throw the rope several times over the cornice and clamped the ballon on a pin threaded into the motor. We haven’t yet figured out how to secure the motor, so someone have to hold it in their hand and tilt it down a little.
My daugter made the sun using the same principle – in the morning it rises to the ceiling, and in the evening it goes down.
So great! I love all your crafts, especially motorized ones!