Frater U∴D∴'s five models of magic: spirit, energy, psychological, and information, plus a meta-model for switching between them.
Chaos Current / Person
Frater U∴D∴
German chaos magician and author of Practical Sigil Magic and High Magic. Originated the five-models framework in the essay Models of Magic.
A practical guide to sigil work: multiple methods, construction, charging, and firing, with exercises and variations.