I had thought I would have to adjust the programme to receive two inputs if I wanted the dancers to be tracked individually, but when we were experimenting in the space, it would jump between the two sources of shadow if the dancers were apart, creating the effect I wanted anyway (two sets of ripples).

Now I’m playing with this visualisation patch, it seems to have two points that it uses to create the animation – an origin point and a sort of black hole point that the colours are sucked into… it might be nice to assign the dancers a point each, so they are always joined to each other by a bridge of colour even when they are apart… illustrating the connection that exists between them at all times during the dance.