I found I hadn't quite got the whole 'rainbow quilt' thing out of my head with the 'Joy' BoM, and having spent quite a lot of time with an old friend who is both not very well at the time of writing, and deeply into all things 'space' and 'sci-fi' , the concept of the 'supernova' started to dig its naughty way into my subconscious... the rest is history. It IS a counterpart to 'Joy'.