Wanted to motorize my world globe so stuck a continuous servo on the top of it and hooked to Arduino Uno. Then the only decision was do I turn it continuously, occassionally or sporadically. I chose occassionally.
Took out the top bolt, replaced with my own bolt and connected that to the servo. Simple in idea but had to work at it a bit. I like things that move a little. This will complement my electro-magnetic pendulum.