I don't really get it but I like it.
Re the fish: even though I'd say everything Inside me is inside me and everything Outside me is outside me, it often feels like there's a little bit of the Inside on the outside or the Outside on the inside. For example, my destiny doesn't feel like it exists within me, but rather outside me, for me to find it. Or similarly that there's some Absolute Truth, of Me, waiting to reveal itself to me when I'm in a different place or different state (of being).
I usually try to remind myself I alone am responsible for my actions, than to give in to mystical thinking.