Portal between two worlds

We have this as a sure and steadfast anchor of the soul, a hope that enters into the inner place behind the curtain (Heb 6:19).

In science fiction, there are two kinds of portals: portals from one time to another and portals from one place to another. The first concerns time travel from past to future or future to past while the second concerns multiverse travel from one parallel universe to another.

On a related note, The Magician's Nephew was the last book Lewis wrote in the Narnia series. It provides a backstory for Narnia. One particular example is how it provides a backstory for the magic wardrobe. The wardrobe is made of apple wood that originates in Narnia. The unstated principle is that the wardrobe is a portal between Narnia and our world because it exists in our world but it originates in Narnia. So it's connected to both worlds. 

These are fictional examples. Heb 6:19 illustrates the same basic principle, only this is factual. The souls of living Christians exist in this world, but are connected to heaven or the world to come by an anchor chain. Like a lifeline, where one end is wrapped around the waist of the Christian while Jesus is holding the other end from heaven and reeling it in. Jesus connects us to heaven and pulls us through because he came from heaven and returned to heaven.