Paradise and Prison

I've never been certain about the barrier between Spirit Prison and Paradise. Is it two different locations, with an actual barrier or separation that keeps those who have not accepted the Gospel from those who have? Or is it just a distinction between two states of being? We certainly live in heaven or hell right now depending on what kind of people we are.

I tend to think it's probably an actual separation. When Christ was in the Sprirt World for three days, He only visited the righteous, that is, those who had truly accepted Him. But a commonly held perception of Hell combined with a distinct feature of temples gives me cause to wonder.

Many people with Christian backgrounds are told that "Hell" is a fiery, hot place, and that "Heaven" is in the clouds. The Church makes specific efforts to build temples such that fonts for proxy baptisms are located underground. Theory: the barrier between Paradise and Prison is the surface of the earth. The core of the earth is molten; anywhere under the surface is obviously dark. I think it would suffice as a place to let people suffer the pains of their own sins. When baptisms and confirmations are perfomed for the dead, the spirits would pass through the barrier in temples.

The bridging of the barrier also occurred simultaneously with the rupturing of the earth's surface (see 3 Nephi 8:18).

One might say that the classic version of "Hell" is of no importance, and I would say they're probably right. However, bits of truth, like pieces of a shattered mirror, can be found all over. Take Masonic symbols, for example.

One might also say that the location of temple baptismal fonts is just symbolic, and maybe it is. That's a lot of work for the sake of a single symbol, though, particularly when baptism already carries a lot of symbolism anyway. What symbolic meaning is really added?

Last thoughts for now:
I don't know of any prophetic statement that directly adresses this topic. It remains uncertain to me.