How to build a starlight projector for your baby
You basically need some structure to hold the flashlight in place, pointing to the spinning cardboard. I have used lego pieces to improvise that structure, but paper boxes or plastic bottles could be used instead. Use a precision knife or retractable blade to cut silhouettes in a rounded sheet of paper. Attach the rounded paper in the spinning motor, using the slide dimmer to calibrate the spinning speed. Only then attach the motor to the structure. It takes some experimenting to figure out the adequate distance between the flashlight and the spinning cardboard.