If everything were to revolve around one topic it'd be the unknown
Because that is the unexplored land we humans have yet to uncover and discover.
Think of it as a newly discovered Hawaii island.
Or a strange city that came out of nowhere because only certain people can walk it's streets.
Or an old forgotten castle.
A photo album that was never known to anyone in the family.
A memory that you had sought to dig out from the back of your mind.
Not us humans nor any living thing can seek out the unknown.
So the unknown is unknown to everyone and everything.