pendulum

First described by Christiaan Huygens in the 17th century, synchronisation was famously illustrated by the aligned swinging of his pendulum clocks.

But, she said, conservatives want to “stop the pendulum from swinging back.”

But the pendulum is about to swing hard in the other direction.

"We're in this moment where we're seeing the pendulum sort of swing back to skinny being 'in' and often these things are treated like a trend and we don't want them to be."

The pendulum between US interventionism and isolationism is closely watched and felt in Ukraine.