The world is made of mind and mind is made of significations. If you ask what significations are then you are only calling up further significations, so that one thing you know is that mind forms an effectively but not necessarily closed world, turned on itself. You know also that every signification is open ended, is not final, is never what it is. Perhaps you also know that mind is an ongoing process and that its acts are internally split into say, matter, act and meaning, each of which are themselves split into matter, act and meaning. All that is not mind is nevertheless mind, mind being closed under every form of negation, but in spite of this mind is not its own foundation. In this context the cogito reads simply, mind has a foundation. The foundation of mind is neither mind nor the negation of mind. Further, it constitutes mind without being mind-like in any respect - being its own foundation. Neither materialism nor panpsychism can indicate this being themselves mental constructions. If you choose to call it consciousness or God you do not mean consciousness of God in any way at all. Metaphysics breaks down, but before it does so it tells you that you cannot have moved one iota outside of your ground.