It's interesting that by doing the trilogy we've entered a semi-blind state where there are continuing elements in the story, we just don't know what happened in the previous section. We've now got a few continuing elements like time travel, the in-between and tunnels, which got me thinking about The Time Tunnel:

https://www.youtube.com/watch?v=mDowitqL1Rc

The actual tunnel appears at about the 1:30 mark of this one.

https://www.youtube.com/watch?v=3MByhY6aSUo

Haha, I think this might have been a bigger influence on my visual aesthetic than I remember.

So in the updated version, you enter the time tunnel, but when you get to your destination, you go into the in-between to find out what REALLY happened.