Never heard of this before, but apparently when two pendulum clocks are put next to each other on the same wall, they tend to “sync up” after a short while. When the pendulum of one clock is to the right, the pendulum on the one next to it is on its left!
This strange phenomena (that, I repeat, I just now heard of!) has vexed scientists and researchers since, believe it or not, being first observed in 1665 (!!!!) and it wasn’t until now that the reason for this phenomena has been solved.
Care to find out for yourself? Then check this article out: