The Grinch: Blast this Christmassy music. It's joyful and triumphant.
The Grinch: Am I just eating because I'm bored?
The Grinch: I'm all toasty inside. And I'm leaking.
The Grinch: All right, you're a reindeer. Here's your motivation: Your name is Rudolph, you're a freak with a red nose, and no-one likes you. Then, one day, Santa picks you and you save Christmas. No, forget that part. We'll improvise... just keep it kind of loosey-goosey. You hate Christmas! You're gonna steal it. Saving Christmas is a lousy ending, way too commercial. Action!
[Max knocks off the nose.] The Grinch: Brilliant! You reject your own nose because it represents the glitter of commercialism. Why didn't I think of that? Cut, print, check the gate, moving on.
Answer: By machine.
The clock in "How the Grinch Stole Christmas" is designed for cinematic effect; a real-world counterpart would rely on precise gearing and engineering to allow three separate wheels to operate in close proximity without interfering with each other. The key would be in the gear ratios and the alignment of the gears to ensure smooth operation of each panel.