You can imagine the origin of a world from the frame of embodiment in a brain and a mind, in a matrix sufficient for a brain and a mind, then deeming the first distinction, letting there be light, separating the firmament from the waters and so on, Genesis through a Kantian filter, and then what is prior to consciousness as an instance of ontogeny recapitulating phylogeny. All of this however might as well be a simulation since you have already presupposed the 'matrix', which is itself a rather sophisticated or downstream product of that very process. No, you have to repeat the experiment without anything like such a matrix, not even from a nothing which is implicitly only the opposite of a something. Without a frame, but still some kind of event. That is what you have to conceive, if even conceiving were allowed.