Sex, drink, drugs, whatever; after several decades on this planet I’ve yet to find anything that compares to the cocktail of Focus and Purpose. The world shrinks to the size of an atom, and you become that atom. It’s a feeling of singularity before the Big Bang; the potential of creation driving you forward uncontrollably.
What separates Humans from animals isn’t our ability to use tools, or even communicate complicated ideas to each other. It’s our creativity: in the act of creation we wear the face of God.