the answer is blowing in the wind

Have you ever observed a grove of pine trees in the wind?

The younger trees, with their vibrant green needles and slender trunks, lurch wildly at the top as they are buffeted by the breeze. Although their range of motion is wide, they eventually settle back down to their home position before the next gust invites them to dance. They can bend quite a bit without breaking, and their trunks waver the least where they connect to the ground.