While working with Alan Lamb in 2006 as part of the Unsound Festival, I mentioned that I'd been thinking about recording the water distribution tank that shared the hilltop with 'the wires' he and Scott Baker had built outside Wagga Wagga in 2004.
Alan encouraged me to put a bead on the end of a wooden skewer to tap around the structure and locate harmonics. It was the first time I'd considered that physical objects other than guitar strings and 'the wires' had harmonics.
This thought returned to me while recording Wandoo Playground and I've been spending more time finding the harmonic sweet spots to place the piezo pick-ups and to tap for creating sounds.
These harmonics form and integral part of creating tracks from the playground equipment and contribute to the melody and chordal progression.