Well done! I've a picture of my water lily leaf and water entering the middle portion of the leaf. The leaf is also somewhat heart shape and the water is a 'reverse heart in it'. Will post sometime. Have to dig up the archives or take a fresh shot. Off subject, you could have added a picture of the most popular man-made design - the 'hearts' in cards!! And also a real heart! Just some thoughts.
Good article - nice to see so many resemblances in everyday things.