Your “spirit” is actually your mind.
This is why when you go out-of-body, it feels like you’re just using your imagination.
The problem many people have with this is the idea that the imagination isn’t “real”, or even the concept that you’re mentally ill if you’re unable to differentiate between imagination and reality.
Don’t think of it so much that what you’re seeing in your imagination is literally “real”, but understand that your mind can be used as a transceiver to INTERPRET energy from higher dimensions.
What you’re seeing in your mind may not literally be “real”, but it can be used as representation to show you something that you have no other way to perceive physically.
Your imagination can be used as a gateway to understanding higher dimensions.
The mind is a powerful tool for meditation.
This is how your spirit goes out-of-body (astral travel).