> claiming God is in Heaven is bound to make people believe Heaven is a literal place where God resides rather than God's presence.
Yeah, I can see your point. I'm just trying to take all of what we're taught about heaven and amalgamate it into and understandable concept. I'm confident that we're taught that "heaven" right now is not a physical place, but is being in the presence of God. When Jesus returns at the end of time and history, "heaven" will become an actual place (the earth) where the presence of God is its most prevalent characteristic. The goal of our lives as Christians is not to be in a place of eternal bliss but rather to be with God and in His presence (which, of course, will bring bliss and could be described as paradise). The concept of heaven is so bound up with other concepts that's it difficult to speak distinctly of them all, and certainly problematic to describe clean and clear separations between them all.
> What do you mean when you suggest Heaven could be both definitions?
I'm saying that God's presence is not a physical place, and therefore not perceivable (i.e., a dimension beyond matter and space). If "heaven" right now is a spiritual reality but not a material one, it can be anywhere. "A dimension beyond" doesn't specify "outside of our known universe," but instead "not composed of matter and energy (as we know them)."
> Just a correction, but I didn't see any "Gold like transparent glass" upon examining Revelation 4.
Yeah, sorry, my mistake. The "gold" and "glass" connection comes in Rev. 21.18 & 21.
> couldn't the throne itself (along with all 24 other thrones) have been literal?
Revelation is tough to interpret. I can assume John was in a visionary state (Rev. 4.2), so it's pretty difficult to claim with certainty that something is "literal." Whether he was communicating a message (symbolic) or the reality he saw (literal) is tough to say. It's also possible that he "saw" something literal and real that was supposed to symbolize its reality. It's not always possible to make a sharp distinction between ecstasy, inspiration by Spirit-enlightenment, and prophetic revelation.
The first thing he "sees" is a throne, connoting such things as (1) it's the central focal point of the vision, (2) it symbolized power, majesty, rule, and authority. Robertson and Kittel both contend that the throne is not literal, but symbolic, since God is nonmaterial spirit. We notice that the occupant of the throne is formless: noncorporeal. So we have to interpret it. How do you perceive it?
As far as the 24 thrones surrounding it, this could be an arrangement symbolizing the architecture of power, so to speak. The central throne is surrounded by a symbolic number of other thrones, magnifying the power of the central throne. Seated on them are 24 beings of recognized authority, all oriented to the central throne. Their attire speaks of holiness and glory (other power images). The crowns of gold also symbolize power and glory. The flashes of lightning speak of revelation (Ex. 19.16; Ps. 18.22ff.) and power (1 Sam. 2.10; Ps. 18.9; Job 37.4). The seven lamps portray illumination and divine presence. The whole scene is one of power, status, authority, purity, and righteousness. After all, this is the God who will render judgment on the earth. We are being shown that he rightfully fills that role. Is it literal? I'm not even sure if that's the right question, y'know?