Enveletration is a mix of the words: envelopment and penetration. Conceptually it is kind of a late-night space out thought trap around the perceived power dynamic of sexual organs, inside out body parts, matter density within a void, atomic structures that are analogous to solar systems, and other weird human-cosmic relations that will really eat your brain if you think on them for a while. It’s basically imposter syndrome for all of humanity relative to the universe.