Source: <<https://youtu.be/uen4-zZcb2Y|youtube video>> where the comments say it is "dedicated to Kathryn Bourke, Richard Graylin and Sandra Hanson of the Hunter Valley Branch, Gosford class, who all turned 70 in 2014. Bars 9 to 24 represent a '7', with the circle completing the '70' (bars 25-32)."