"You" are a self-referential/recursive (conscious) open information sub-system interacting with other open information sub-systems, some recursive others terminal (not conscious), all of which, together, constitute a singular, closed self-referential/recursive information system.
The reality that "you" experience is a subjective experience of this closed self-referential/recursive information system from within it. Only the closed system, itself, can have an objective, holistic experience. It has no physical substance. It is a topologically one dimensional singularity composed entirely of data. This data is processed by the conscious sub-systems which (who) interpret/experience it as a voxelated fractal bounded by 3 spatial dimensions.