Good experiment - felt a little underwhelming in current avatar.

The motion appears jerky and unnatural -- as they are being forced to move by the mechanism at the bottom versus a natural setting that has the lower stems fixed in place and orientation while the tops sway.

Also when you have a large number of these stalks in nature we often see them sway in "waves" as smal gusts of wind blows over them in one direction causing sometimes visible ripples along the top 'surface'.

Also, who is to say if the sensor is capturing the wind/movement at source faithfully and rest of the mechanism is reproducing it well.