It all follows a central theme, too.
This episode talks about coping with loss, about heading into unknown territory, and unable to see ahead of you. It addresses the fear that the same specter of death that took your loved one may be waiting there for you, but you have to keep moving, because if you don't keep moving, you will die anyway as the fear of death will eat you alive, because in the end, death comes for us all.
Instead, focusing on something other than the pain, the confusion, the sensory overload itself, by becoming aware of what is happening around you, that can help you handle the path ahead.
The whole episode is allegorical. It hits home for me, and so I felt this episode a little more deeply than I have previous episodes. It was very well done, if you're looking at it from a specific point of view.