with objectivity "absent" every point of view holds exactly the same amount of legitimacy. the concept of "mental illness" is obliterated.
it is a hugely important question
the way we understand the universe is based on math. particles follow trajectories based on laws governing their behavior
however, those laws do not necessarily say anything about the universe itself. we can predict everything, we can make things and manipulate, but we cannot (at this moment in time) know anything about *what it is* that we are predicting, manipulating, measuring
we live in a world of emergent properties of vast numbers of particles, all those particles following their trajectories (ruling out the free will thingy; it is an emotion that deceives us imo). so, when a "thing" like a computer exists, yes it is physical and can be said to truly exist, but in what context does it exist (ie, is there a multiverse where it branches off at each decision and forms a humongous tree of possibilities, and perhaps even the whole thing is physically connected through higher dimensions so that you can "slide through universes" and as you slide the laws change slightly and the farther you go the more different the universe is (so, going a short distance means you have gone to a place where everything is pretty much the same). there are so many possibilities as to the context of "what exists, how, why"
not only that, but even taking into account all of those weird physical possibilities, we cannot get much more than guesswork at the question "what it is". our philosophies only go down to a certain level. ie, a laptop is made of trillions of atoms arranged in just the right arrangement so that information will be able to input, process, and output in a way usable by humans. those atoms, though, are more mysterious, following more complicated mathematical laws, and the world of the atomic is vastly different than this emergent world we live within and have evolved to think within. even more, there is the nagging question physics cannot yet do anything about: the fundamental particles that make up everything, why are they here? why is spacetime, a malleable stretchable and expandable structure that holds all of the particles in it and intimately interacts with them (i see particles sort of as ripples on this spacetime fabric; spacetime fabrics, whether 3-dimensional or 5-dim or *-dim, are called branes; they exist within the bulk; this is speculation from M-theory), why is spacetime and its ripple-particles here? what gives rise to it?
so, in essence, what ***IS*** that fucking computer? in order to answer the question, or at least get progress underway, perhaps we'd need to alter our consciousnses so that we can A) think in higher dimensions, B) receive sensual intuitive input from other realities like the quantum physical realm or higher dimensional realms we may discover, C) and thus be able to "look at the universe from the outside"
but even then, we are still stuck with possibilities like "this is still all an elaborate simulation" and things of that nature, or that we are somehow being tricked (thanks descartes)
so, the question is an interesting one. what is a butane lighter?