The essay that introduced the five-models framework for understanding magical practice: spirit, energy, psychological, and information models, plus a meta-model that treats them as interchangeable tools. Short, widely referenced, and free to read online.
Chaos Current / Person
Frater U∴D∴
German chaos magician and author of Practical Sigil Magic and High Magic. Originated the five-models framework in his essay Models of Magic.
A practical guide to sigil work covering multiple methods, construction, charging, and firing. Includes exercises and variations.