Very cool. It reminds me of a prop my daughter created in high school.
If I recall correctly, the play was Agatha Christie's "And Then There Were None." The play had to have a grandfather clock. Certain things happen in the play when the clock chimes at specific times. Spooky things. Any how, my daughter was the props manager and there was no budget for a grandfather clock!
Luckily, a student in the group happened to have an empty grandfather clock case at home that his family had thought to fix up one day. My daughter found a cheap ($5?) clock face to put in it from a local clock and watch shop. The clock shop also set her up with a cheap mechanism for a pendulum: she attached a wooden stick with a round disk on the end of it to some kind of motor and it worked! ...for about a minute. The motor was too weak for the heavy stick and metal disk, but once it got swinging, it would go for a while. So, during the performances, at every scene change, my daughter had to walk past the grandfather clock to give the pendulum a good push to keep it ticking.
I love this, very simple but great effect. I saw something similar on another forum where someone had done a Trompe l'oeil grandfather clock, can't remember which one so can't post a pic but it even had a little mouse sat in it.
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