How are Dark Mtter and Consciousness different from Spirit?

[robvalue]

PS:

I'm not trying to be difficult or argumentative, I genuinely have no conception of how something can exist yet be non-physical

Of course, that doesn't mean it's impossible. That would be an argument from incredulity. But to suppose something non-physical as an explanation would appear to require exhausting all physical explanations there could ever be. How could this be done?

Has anything non-physical ever been observed to exist? If not, how can it even be suggested as an explanation? Of course, it could be physical, but just behave very differently to the physical stuff we're used to.

Or like... anti matter or something? My science isn't so good at this stage