So, in the beginning, they don't know what exactly they are doing, or what they are working with? That seems like it might make it hard to... do anything. I'm happy to let them figure out their purpose as they go along, but maybe we should at least pick the two things they will be weaving? Or not...?

Maybe, if we leave it abstract, we could change with what they are weaving over time? Like, it isn't just two things, but an infinite number of things put into two groups?