"what the hell is the universe?" A mathematical structure? Perhaps a perspective/viewport/subset of the entirety of mathematical possibility? What's between no

"what the hell is the universe?" A mathematical structure? Perhaps a perspective/viewport/subset of the entirety of mathematical possibility? What's between nothing and 'something' (0 and 1)? Seems to me that's only a valid question if asked by a consciousness experiencing it (tree/woods/sound yada yada).