As I continue elaborating this string game work, I would like to offer an appreciation and homage to James Murphy, whose webspace bears the title “TorusFlex,” referring to the reality that a loop of string is, mathematically, a torus, or doughnut shape. Here’s a link to his page:

James Murphy displays one of his elaborate figures

I highly recommend his eBook, Why String Games? Last I checked it was only available for the iPad.