Apparently Fiona was quite struck by the rhythmic element, because when we stopped one of the teens in the orchestra mentioned that she'd been drawing using the same physical movement, matching the rhythm of the piece. I asked Fiona for her sketchbook and looked at what she'd been working on ... and there was the unmistakable pattern of the eighth-note rhythm on the page. Very cool! Normal she draws either loops and O's, or tiny, discrete letter-like scratches, so this was quite distinctive.
So I was reminded of the fun of 'drawing what you hear in music' which is a lovely process-oriented form of art that we did a fair bit of three years ago in preparation for the musical puzzle project. We'll have to do some of this again.