Hand gestures improve nature?

Today's art was inspired by a scene we've witnessed in pretty much every place we've been. What do these hands gestures accomplish?!  These silhouettes are all actual people that I've photographed doing this stuff (and often their gestural photo shoots  go on for 30 minutes until some sort of perfect hand position is achieved...and then the other person has to do the exact same thing!).

We spent yesterday in the McLaren Vale which is lovely wine country. And it's such a chilled out, unpretentious, unpressured experience. Highly recommended!