Root meaning: What truly and permanently exists independent of deception, illusion and subjective opinion. Conventional: the physical world and cosmos. ACIM: a transcendental realm known as Heaven, eternity or the Kingdom of God. Reality is pure spirit. It is changeless, eternal, formless, boundless. It has no different orders or levels. It is total, one and cannot be known partially. In it part and whole are identical; we are part of reality and all of reality. Even though reality is completely obvious, we lost awareness of it when we tried to be the author of reality, including our own reality. See illusion. See T-30.VIII.1,4.