In the specific context of Carlos Castaneda, the tonal is what makes the world. Don Juan Matus asserts that we all sense the Tonal/Nagual pair but the Tonal, as we grow, tries to hide the Nagual. But it can't hide the fact there's a true pair, so it "cheats" and we end believing in God/devil, body/soul, mind/spirit, good/evil - that are fake pairs, 100% tonal.